| 2 | 1883 Flood |
| 1 | 1892 Fire |
| 1 | 1909 Tariff Act |
| 3 | A. B. Chance Company |
| 1 | A. L. Dyke |
| 5 | A. O. Austin |
| 1 | A.F.G.W.U. |
| 1 | AC vs DC |
| 49 | AFGWU |
| 1 | AT&T |
| 1 | Accident |
| 3 | Acme Porcelain Works |
| 178 | Ad |
| 14 | Adamant Porcelain Company |
| 1 | Aeromotor Company |
| 8 | Aetna Insulator |
| 1 | Afghanistan |
| 2 | Agent |
| 9 | Ajax Line Material Company |
| 2 | Akron China Company |
| 31 | Akron Hi-Potential Porcelain Company |
| 50 | Akron Insulator & Marble Company |
| 3 | Akron Marble Works |
| 1 | Akron Marble and Novelty Company |
| 1 | Akron Pottery Company |
| 13 | Akron Smoking Pipe Company |
| 1 | Akron Stone Marble Company |
| 1 | Akron Toy Company |
| 4 | Alberhill Coal and Clay Company |
| 1 | Alberhill Pottery Co. |
| 28 | Albert & J. M. Anderson Company |
| 1 | Albert & J. M. Anderson Manufacturing Company |
| 5 | Albert Vickers |
| 17 | Alley Agate Company |
| 45 | Alley Glass Company |
| 1 | Allgemeine Elektricitaets-Gesellschaft |
| 1 | American Carbon & Battery Company |
| 1 | American Carbon Battery Company |
| 4 | American Electric Porcelain Company |
| 17 | American Hot Cast Porcelain Company |
| 11 | American Insulator Company |
| 11 | American Iron Glass Pipe & Plate Company |
| 3 | American Lava Company |
| 1 | American Lava Manufacturing Company |
| 13 | American Marble & Toy Manufacturing Company |
| 7 | American Marble Works |
| 1 | American Porcealain Company |
| 2 | American Porcelain Company |
| 5 | American Porcelain Works |
| 4 | American Potteries Company |
| 1 | American River |
| 1 | American Telephone and Telegraph Company |
| 8 | American Union Telegraph Company |
| 1 | American Vitrified Conduit Company |
| 1 | Amos Clifford Shinkle |
| 63 | Anacortes Glass Company |
| 5 | Anchor Electric Company |
| 2 | Anchor Pottery |
| 34 | Anderson Porcelain Company |
| 1 | Andrew's Insulator |
| 1 | Anglo-American Potteries |
| 3 | Angus Hibbard |
| 2 | Anna Johnson Hemingray |
| 11 | Annual Shut-Down |
| 2 | Anthony Gray |
| 1 | Apple River |
| 16 | Arc Light |
| 3 | Arcing Ring |
| 2 | Argentina |
| 3 | Aries Brooke |
| 3 | Arizona |
| 75 | Armstrong Cork Company |
| 1 | Arrowheads |
| 12 | Arthur Watts |
| 5 | Artistic Porcelain Company |
| 2 | Ashworth |
| 4 | Association of Flint & Lime Glass Manufacturers |
| 20 | Associations |
| 1 | Atlantic and Pacific Telegraph Company |
| 13 | Atlas Glass Company |
| 4 | Atwood Faience Company |
| 18 | Aurora, Elgin & Chicago Railway |
| 7 | Australia |
| 20 | Australian Glass Manufacturing Company |
| 1 | Australian Porcelain Company |
| 2 | Australian Porcelain Company Proprietary, Ltd |
| 3 | Automatic Machinery Manufacturing & Sales Company |
| 1 | Babson Brothers Company |
| 2 | Bain Insulator |
| 2 | Bakelite |
| 4 | Baker & Cutting Glassworks |
| 1 | Bakersfield |
| 1 | Ball Brothers |
| 1 | Ball Electric Light Company |
| 55 | Baltimore Glass Manufacturing Company |
| 45 | Baltimore and Ohio Telegraph Company |
| 1 | Bangor |
| 1 | Bankers & Brokers Telegraph Company |
| 1 | Barb-Wire Telephone |
| 32 | Barberton Pottery Company |
| 1 | Barclay |
| 2 | Barnes & Kobert Manufacturing Company |
| 1 | Barton, VT |
| 8 | Batchelder |
| 8 | Battery Insulator |
| 91 | Battery Jar |
| 143 | Battery Jars |
| 7 | Baum |
| 13 | Bay Counties Power Company |
| 21 | Bay State Glass Works |
| 3 | Beaver Falls Glass Company |
| 2 | Bed Insulator |
| 3 | Belgium |
| 1 | Bell Insulator |
| 54 | Bell Pottery Company |
| 1 | Belleek Potteries |
| 1 | Benjamin Dinsmore |
| 7 | Bennett |
| 15 | Bennington Pottery |
| 2 | Bentley Plimpton |
| 4 | Berkshire Glass Sand Company |
| 1 | Bernard |
| 36 | Bertram M. Downs |
| 1 | Bessie Hemingray |
| 2 | Bibber-White Company |
| 7 | Big Cottonwood Canyon |
| 1 | Bird's Nest |
| 9 | Birmingham Glass Manufacturing Company |
| 3 | Birth |
| 1 | Bishop Creek |
| 1 | Black Glaze |
| 1 | Block Insulator |
| 1 | Bloes |
| 11 | Bloom Jar Company |
| 2 | Bloomfield |
| 2 | Blue Lakes |
| 1 | Boch |
| 21 | Boch Patent |
| 1 | Boch-Metsch Porcelain Company |
| 1 | Bodie |
| 1 | Bohemia |
| 1 | Bois D'Arc |
| 1 | Bolt Insulator |
| 1 | Borel |
| 1 | Boro-Silica Insulator |
| 1 | Boro-silicate Glass |
| 1 | Boston |
| 11 | Boston Bottle Works |
| 6 | Boston Electric Light Company |
| 1 | Boston and Sandwich Glass Company |
| 2 | Bottles |
| 50 | Bracket |
| 1 | Brackets |
| 33 | Bradford Shinkle |
| 5 | Bradley A. Fiske |
| 3 | Bradley Fiske |
| 1 | Brazil |
| 1 | Breckenridge |
| 2 | Brent Mills |
| 1 | Brett and Little |
| 14 | Brian Pottery Company |
| 1 | Brick Insulators |
| 3 | Bridle Ring |
| 8 | Bright's Insulator |
| 35 | Brilliant Glass Company |
| 1 | Brimstone Insulator |
| 14 | British Insulator |
| 3 | British Insulite Company |
| 1 | Brock Glass Company |
| 3 | Brodie |
| 5 | Brodie Electric Company |
| 2 | Brodie Tree Insulator |
| 615 | Brookfield |
| 3 | Brookfield Catalog |
| 5 | Brookfield Family |
| 39 | Brookfield Glass Company |
| 3 | Brown Boveri |
| 3 | Brown Duplex Insulator |
| 1 | Brunt |
| 1 | Brunt & Thompson |
| 1 | Brunt Porcelain Company |
| 1 | Brunt Tile & Porcelain Company |
| 6 | Brunt Tile and Porcelain Company |
| 14 | Brunt and Thompson |
| 2 | Brush Electric Light Company |
| 2 | Brusio |
| 1 | Bryant Electric Company |
| 2 | Buck |
| 1 | Buffalo |
| 1 | Buller |
| 1 | Buller & Co. |
| 1 | Buller & Jobson |
| 1 | Bunnell |
| 1 | Bureau Knob |
| 1 | Burke |
| 2 | Bus Bar Insulator |
| 122 | Bushwick Glass Works |
| 4 | Business Connection |
| 14 | Business Trip |
| 1 | Butler Hard Rubber Company |
| 1 | Butte |
| 7 | Buzby |
| 1 | C. E. Eveleth |
| 1 | C. S. |
| 24 | C. S. Knowles |
| 1 | C. W. |
| 2 | CD 1000 |
| 1 | CD 1010 |
| 1 | CD 1012 |
| 1 | CD 1014 |
| 1 | CD 102 |
| 1 | CD 1037 |
| 5 | CD 1038 |
| 6 | CD 106 |
| 1 | CD 109 |
| 1 | CD 109.5 |
| 1 | CD 109.7 |
| 1 | CD 110 |
| 5 | CD 110.5 |
| 5 | CD 110.6 |
| 1 | CD 113 |
| 1 | CD 114.2 |
| 1 | CD 116 |
| 2 | CD 1182 |
| 3 | CD 121 |
| 1 | CD 121.4 |
| 1 | CD 122 |
| 1 | CD 122.4 |
| 6 | CD 123 |
| 1 | CD 124.5 |
| 1 | CD 125 |
| 1 | CD 126 |
| 1 | CD 126.3 |
| 1 | CD 128 |
| 2 | CD 132.4 |
| 1 | CD 134 |
| 1 | CD 134.6 |
| 9 | CD 135 |
| 2 | CD 139 |
| 2 | CD 140 |
| 2 | CD 141.8 |
| 2 | CD 141.9 |
| 1 | CD 143.4 |
| 6 | CD 144 |
| 2 | CD 145 |
| 2 | CD 147 |
| 1 | CD 150 |
| 1 | CD 151 |
| 4 | CD 152 |
| 2 | CD 154 |
| 9 | CD 158.6 |
| 1 | CD 160 |
| 5 | CD 162 |
| 1 | CD 162.4 |
| 2 | CD 164 |
| 1 | CD 168 |
| 1 | CD 176.9 |
| 2 | CD 178 |
| 1 | CD 178.2 |
| 1 | CD 178.5 |
| 1 | CD 180 |
| 2 | CD 180.5 |
| 16 | CD 181 |
| 1 | CD 185 |
| 1 | CD 187 |
| 1 | CD 190 191 |
| 3 | CD 190-191 |
| 2 | CD 196 |
| 1 | CD 196.2 |
| 5 | CD 202 |
| 1 | CD 203 |
| 5 | CD 204 |
| 1 | CD 206.5 |
| 3 | CD 207.5 |
| 1 | CD 208 |
| 3 | CD 211 |
| 9 | CD 244 |
| 5 | CD 245 |
| 4 | CD 249 |
| 3 | CD 257 |
| 8 | CD 259 |
| 2 | CD 263 |
| 3 | CD 269 |
| 1 | CD 280 |
| 4 | CD 282 |
| 18 | CD 283 |
| 1 | CD 284 |
| 2 | CD 286 |
| 1 | CD 286.9 |
| 11 | CD 287 |
| 3 | CD 287.1 |
| 3 | CD 287.2 |
| 10 | CD 288 |
| 6 | CD 293 |
| 1 | CD 300 |
| 1 | CD 303 |
| 13 | CD 303-310 |
| 5 | CD 304-310 |
| 3 | CD 308 |
| 2 | CD 310 |
| 5 | CD 313 |
| 5 | CD 313.1 |
| 2 | CD 317 |
| 1 | CD 317.5 |
| 5 | CD 317.8 |
| 1 | CD 317.9 |
| 1 | CD 319 |
| 1 | CD 321 |
| 1 | CD 331 |
| 6 | CD 342 |
| 1 | CD 35 |
| 1 | CD 36 |
| 4 | CD 630 |
| 4 | CD 631 |
| 1 | CD 732.2 |
| 3 | CD 734 |
| 1 | CD ??? |
| 1 | Cable Insulator Company |
| 91 | Cadiz Glass Company |
| 1 | Calgary |
| 35 | California |
| 24 | California Electrical Works |
| 175 | California Glass Insulator Company |
| 23 | California Glass Works |
| 4 | Calista Gray |
| 1 | Callaway County Clay Company |
| 8 | Cambridge Electric Light Company |
| 1 | Camilla Shinkle |
| 19 | Canada |
| 3 | Canada Glass Company |
| 1 | Canada Glass Corporation |
| 1 | Canadian |
| 1 | Canadian General Electric Company |
| 4 | Canadian Glass Manufacturing Company |
| 2 | Canadian Niagara Power Company |
| 2 | Canadian Ohio Brass Company |
| 1 | Canadian Pacific Railroad |
| 5 | Canadian Pacific Railway Company |
| 1 | Canadian Pacific Railway Telegraph Company |
| 3 | Canadian Pacific Telegraph |
| 2 | Canadian Porcelain Company |
| 3 | Canon City |
| 1 | Canon Ferry |
| 8 | Canton Insulator & Clay Company |
| 3 | Caoutchouc |
| 1 | Capanema |
| 1 | Car Stop |
| 3 | Carey Ohio Porcelain Company |
| 3 | Carl H. Smith |
| 1 | Carlotta Campiglio |
| 5 | Carquinez Straits |
| 1 | Carrier Circuit |
| 9 | Carroll Hemingray |
| 4 | Carroll and Llewellyn Hemingray |
| 2 | Case Transposition |
| 8 | Cassius Alley |
| 1 | Catalog |
| 2 | Catawba River |
| 1 | Catenary |
| 2 | Catherine Hemingray |
| 2 | Cauvet |
| 1 | Cement |
| 1 | Cement-Hood |
| 1 | Central District & Printing Telegraph Company |
| 3 | Central Electric Company |
| 1 | Central Glass Works |
| 1 | Central Pacific Railroad |
| 3 | Central Porcelain Works |
| 1 | Ceramic Electrical Company |
| 1 | Ceramic Porcelain Company |
| 6 | Ceramic Products Corporation |
| 4 | Chambers |
| 1 | Chambers Lightning Protection Company |
| 2 | Chambly |
| 5 | Champion Glass Works |
| 6 | Champion Porcelain Company |
| 3 | Champion Spark Plug Company |
| 2 | Charles Bright |
| 4 | Charles Howell Cook |
| 1 | Charles Kimble |
| 1 | Charles P. Steinmetz |
| 15 | Charles T. Chester |
| 6 | Charles Tigner |
| 1 | Chauvin |
| 9 | Chelsea Pottery |
| 2 | Chesapeake and Potomac Telephone Company |
| 19 | Cheshire Glass Manufacturing Company |
| 1 | Chesney |
| 1 | Chicago |
| 43 | Chicago Insulating Company |
| 3 | Chicago, Lake Shore and South Bend Railway |
| 58 | Child Labor |
| 2 | China |
| 4 | China Products Company |
| 1 | Christmas |
| 3 | Chubbuck |
| 1 | Cincinnati Porcelain Company |
| 3 | Circle F Manufacturing Company |
| 4 | Citizen's Electric Light Company |
| 9 | Civil War |
| 1 | Clamp |
| 1 | Clara Keck |
| 1 | Clark Electric & Manufacturing Company |
| 1 | Clarke Electric & Specialty Manufacturing Company |
| 1 | Clarken Company |
| 9 | Clay Casting Company |
| 1 | Clay Forming Company |
| 1 | Clay Products Company |
| 78 | Cleat |
| 2 | Cleveland Paper Insulator |
| 2 | Climax Porcelain Company |
| 1 | Climax Pottery Company |
| 1 | Clincho |
| 2 | Cloche-Mehun Insulator |
| 20 | Coal |
| 1 | Cohansey Glass Company |
| 1 | Cole Brothers |
| 1 | Colgate |
| 13 | Collins Overland Telegraph |
| 5 | Colonial Insulator Company |
| 9 | Colonial Sign & Insulator Company |
| 7 | Colonial Sign Company |
| 2 | Colophite Manufacturing Company |
| 1 | Color |
| 8 | Colorado |
| 12 | Colorado City Glass Works |
| 2 | Colorado Electric Power Company |
| 3 | Columbia Insulator Company |
| 1 | Columbian Exposition |
| 1 | Combination Insulator |
| 1 | Commonwealth Art Pottery and Insulator Company |
| 1 | Communication Equipment and Engineering Company |
| 8 | Community Relations |
| 1 | Compagnie Generale d'Electricite' |
| 1 | Compagnie Generale d'Electro-Ceramique |
| 1 | Composition Insulator |
| 1 | Compressed Air |
| 1 | Compression Glaze |
| 1 | Compromise Pattern |
| 2 | Connecticut |
| 1 | Connecticut Electric Manufacturing Company |
| 2 | Connecticut Porcelain Company |
| 5 | Conover Insulator Company |
| 6 | Consolidated Electric Light Company |
| 16 | Consumers Insulator Company |
| 1 | Continental Rubber Works |
| 1 | Contract |
| 6 | Converse |
| 1 | Conway Taylor |
| 3 | Conway Taylor Hemingray |
| 6 | Cook Porcelain Insulator Corporation |
| 25 | Cook Pottery Company |
| 1 | Cook's Insulator |
| 1 | Cooke |
| 1 | Cooke & Wilson Company |
| 2 | Cooke-Wilson Electric Supply Company |
| 1 | Coors Ceramic Company |
| 4 | Coors Porcelain Company |
| 2 | Cordeaux |
| 1 | Cornell |
| 273 | Corning Glass Works |
| 1 | Corwico |
| 1 | Cost of Line Construction |
| 1 | Court Cases |
| 11 | Covington |
| 21 | Covington Glass Company |
| 2 | Cowboy Hat |
| 3 | Creager Cleat |
| 13 | Creaghead Engineering Company |
| 2 | Crighton |
| 1 | Cripple Creek |
| 2 | Cromwell Fleetwood Varley |
| 1 | Cross |
| 5 | Crouse-Hinds Electric Company |
| 1 | Crown Crystal Glass Company, Ltd. |
| 17 | Cryolite |
| 34 | Crystal Glass Company |
| 1 | Crystal Glass Manufacturing Company |
| 1 | Crystal Palace |
| 3 | Crystal Porcelain Company |
| 33 | Crystalite Products Corporation |
| 1 | Curry-McQuilken Company |
| 1 | Cut-Out |
| 1 | Cut-out |
| 13 | Cutter |
| 141 | D. C. Jenkins Glass Company |
| 48 | D. M. Steward Manufacturing Company |
| 6 | Daniel Ashworth |
| 21 | Daniel Carroll Hemingray |
| 141 | David Brooks |
| 2 | David Crossley |
| 1 | David Munson |
| 4 | Davidson & Stevenson Porcelain Company |
| 12 | Davidson Porcelain Company |
| 1 | De Cew Falls |
| 4 | Dead-end Spool |
| 1 | Deadend Spool |
| 101 | Death |
| 1 | Defuisseaux |
| 1 | Delta-Bell Insulator |
| 1 | Denmark |
| 1 | Dennis Donovan |
| 32 | Denver |
| 5 | Derry China Company |
| 2 | Deseret Telegraph Company |
| 47 | Detroit Electrical Works |
| 1 | Diamond Expansion Bolt Company |
| 64 | Diamond Flint Glass Company |
| 78 | Diamond Glass Company |
| 4 | Diamond Porcelain Company |
| 1 | Die Making |
| 1 | Dielectrine |
| 2 | Dillon Glass Works |
| 2 | Dirigo |
| 244 | Dominion Glass Company |
| 2 | Dominion Insulator & Manufacturing Company |
| 3 | Doulton & Company |
| 1 | Dry Process |
| 1 | Dry Spot Insulator |
| 1 | Duluth |
| 8 | Duncan |
| 13 | Dunton & Field |
| 20 | Duquesne Glass Company |
| 46 | Dyke |
| 3 | Dyke Marble and Toy Works |
| 3 | E. G. Bernard Company |
| 1 | E. H. Merrill Company |
| 1 | E. L. Insulator |
| 18 | E. S. Greeley & Company |
| 1 | Eagle Porcelain Company |
| 12 | Eagle Pottery Company |
| 2 | Earthenware Insulator |
| 1 | East End China Company |
| 3 | East End Pottery Company |
| 2 | East Liverpool |
| 2 | East Liverpool Potteries Company |
| 2 | Ebonite |
| 1 | Economic Conditions |
| 3 | Ed Tigner |
| 20 | Edgar Evans |
| 2 | Edison |
| 1 | Edward Tigner |
| 1 | Edwin Clark |
| 1 | Egg |
| 1 | Eichberg Tree Insulator |
| 2 | Electra |
| 6 | Electric Appliance Company |
| 1 | Electric Insulator Company |
| 32 | Electric Porcelain & Manufacturing Company |
| 28 | Electric Porcelain Company |
| 2 | Electric Porcelain Manufacturing Company |
| 2 | Electric Service Supplies Company |
| 5 | Electric Storage Battery Company |
| 1 | Electrical China Company |
| 20 | Electrical Construction & Maintenance Company |
| 2 | Electrical Exhibitions |
| 23 | Electrical Glass Corporation |
| 1 | Electrical Glassware |
| 8 | Electrical Insulator Manufacturing Company |
| 2 | Electrical Porcelain |
| 33 | Electrical Porcelain Company |
| 1 | Electrical Porcelain Products Company |
| 41 | Electrical Supply Company Chicago |
| 1 | Electrical Testing |
| 1 | Electron |
| 1 | Electrose |
| 33 | Electrose Manufacturing Company |
| 1 | Elektro Porcelain Company |
| 4 | Elgin and Belvidere Electric Railway |
| 1 | Elkins Tree Insulator Company |
| 29 | Ellenville Glass Works |
| 11 | Elliott |
| 39 | Elmer Glass Company |
| 2 | Emminger |
| 14 | Empire China Works |
| 1 | Employee |
| 238 | Employees |
| 1 | Empreza Electra-Ceramica |
| 1 | Enggren |
| 5 | England |
| 1 | Ernest E. Bilby |
| 2 | Etheridge |
| 1 | Etho Insulator |
| 4 | Etruria Pottery |
| 3 | Eureka Cleat |
| 4 | Europe |
| 1 | European Insulator |
| 19 | Evans |
| 2 | Everready Porcelain Company |
| 1 | Excelsior Glass Company |
| 1 | Excelsior Pottery Works |
| 5 | Ezra Cornell |
| 3 | F. J. Barnard |
| 1 | FIX DOLLAR |
| 1 | Factory Equipment |
| 4 | Factory Rebuild |
| 1 | Fairmount |
| 1 | Fairmount Glass Works |
| 21 | Family |
| 2 | Faradoid |
| 3 | Farmer |
| 4 | Fay Clamp |
| 10 | Federal Porcelain Company |
| 2 | Feeder Insulator |
| 54 | Felix |
| 5 | Female Labor |
| 1 | Fernando C. Mesa Company |
| 15 | Fiberite Company |
| 21 | Findlay Electric Porcelain Company |
| 4 | Findlay Glass and Carbon Company |
| 90 | Fire |
| 1 | Fire Grenade |
| 1 | Firebrick Insulator Company |
| 2 | Fireplug |
| 3 | First Insulator |
| 6 | Fisher Electric Company |
| 2 | Fishing |
| 3 | Fisk Street Station |
| 5 | Fiske-Mott |
| 1 | Fletcher Insulator |
| 5 | Fletcher Manufacturing Company |
| 28 | Flood |
| 5 | Floor Insulator |
| 2 | Floor Tubes |
| 3 | Fog |
| 1 | Fog Box |
| 1 | Fog Type |
| 2 | Fog-Type |
| 1 | Fogbowl |
| 9 | Folsom |
| 3 | Folsom-Sacramento |
| 1 | Ford City Pottery |
| 75 | Foree Bain |
| 161 | Foreign |
| 1 | Foreign Glass |
| 13 | Foreign Insulator |
| 6 | Foreign Porcelain |
| 1 | Fowler Insulator Syndicate |
| 1 | Fox |
| 4 | France |
| 1 | Frank Baum |
| 30 | Frank Fisher |
| 2 | Frank H. Riddle |
| 3 | Frank Riddle |
| 1 | Franklin Porcelain Company |
| 311 | Fred Locke |
| 2 | Fred M. Locke |
| 2 | Fred M. Locke & Company |
| 45 | Frederic Duggan |
| 2 | Frederic Gisborne |
| 3 | Freeman Electric Company |
| 5 | Freeman Electric Porcelain Company |
| 1 | Frenchtown Porcelain Company |
| 4 | Fresno |
| 1 | Fritz |
| 4 | Fruit Jar |
| 57 | Fuel |
| 1 | Fuller |
| 2 | Fuller & Son |
| 4 | Fuseholder |
| 35 | G. F. Brunt Porcelain Company |
| 1 | G. W. Thomas |
| 1 | GGBBA |
| 1 | Garrity |
| 211 | Gayner Glass Works |
| 257 | General |
| 60 | General Electric Company |
| 28 | General Porcelain Company |
| 9 | George Brunt |
| 2 | George Floyd |
| 1 | George Fry |
| 1 | German |
| 6 | Germany |
| 3 | Gerry |
| 2 | Gilbert |
| 2 | Gilbert's Shackle Ball |
| 2 | Gilchrist Jar Company |
| 1 | Gill Brothers |
| 3 | Gill Clay Pot Company |
| 2 | Gingerbread Man |
| 1 | Ginori |
| 1 | Gisborne |
| 1 | Gladding Ceramic Insulator Company |
| 28 | Glass |
| 20 | Glass Ballot Box |
| 4 | Glass Block |
| 31 | Glass Conduits |
| 2 | Glass Industry |
| 38 | Glass Insulator |
| 1 | Glass Knob |
| 3 | Glass Milk Pans |
| 2 | Glass Patent |
| 1 | Glass Presses |
| 1 | Glass Ring |
| 1 | Glass Rosettes |
| 1 | Glass additives |
| 3 | Glass vs Porcelain |
| 1 | Glass-Unknown |
| 2 | Glaze |
| 2 | Glaze color |
| 8 | Glaze-Filled Insulator |
| 1 | Glaze-filled |
| 2 | Glazeweld |
| 1 | Glazewelds |
| 5 | Gleason-Tiebout Glass Company |
| 15 | Globe Pottery Company |
| 3 | Goddard |
| 1 | Good Manufacturing Company |
| 2 | Goodyear |
| 5 | Goodyear Vulcanite Company |
| 1 | Gordon Battery Company |
| 18 | Gould & Watson Company |
| 6 | Gould, Inc. |
| 3 | Grand Rapids |
| 2 | Grand Rapids, Holland and Lake Michigan Rapid Railway |
| 1 | Granite Marbles |
| 1 | Gravity Insulator |
| 35 | Gray |
| 2 | Great Barrington |
| 1 | Great North Western Telegraph Company |
| 1 | Great Northwestern Company |
| 2 | Great Northwestern Telegraph Company |
| 4 | Greenwood China Company |
| 11 | Greenwood Pottery Company |
| 1 | Gromo, Italy |
| 7 | Guanajuato |
| 1 | Guard Wire Insulator |
| 1 | Guido Semenza |
| 1 | Gun |
| 1 | Gustafsberg Pottery |
| 2 | H. B. Camp Pottery |
| 269 | H. C. Fry Glass Company |
| 3 | H. D. Murdock |
| 1 | H. E. Hoenig |
| 2 | H. E. Swift Manufacturing Company |
| 3 | H. H. Cochrane |
| 1 | H. L. China Company |
| 7 | H. L. Dixon |
| 1 | H. Schomburg and Sons Company |
| 98 | H. T. Paiste |
| 65 | H. W. Johns Manufacturing Company |
| 57 | H. W. Johns-Manville Company |
| 17 | Haley Insulator |
| 4 | Hall China Company |
| 1 | Hamilton |
| 5 | Hamilton Glass Company |
| 24 | Hammond Cleat & Insulator Company |
| 2 | Hanson |
| 84 | Hardware |
| 1 | Hardwood Insulator |
| 66 | Harloe Insulator Company |
| 1 | Harold Buck |
| 1 | Harrison G. Dyar |
| 1 | Harrison G. Dyer |
| 1 | Hartford Electric Light Company |
| 22 | Hartford Faience Company |
| 2 | Hawken |
| 5885 | Hemingray |
| 922 | Hemingray Family |
| 707 | Hemingray Glass Company |
| 1 | Hemingray, Joseph C. |
| 1 | Hemingray, Ralph |
| 5 | Hemingray, Ralph Gray |
| 1 | Hemingray, Robert |
| 2 | Hemming Manufacturing Company |
| 1 | Hendee |
| 7 | Henry Brunt |
| 3 | Henry Brunt and Son |
| 15 | Henry Floy |
| 4 | Henry M. Byllesby |
| 1 | Hermsdorf Porzellanfabrik |
| 2 | Hetherington Insulator |
| 1 | Hewett |
| 18 | Hewlett |
| 1 | High-Tension Line Construction |
| 1 | High-Voltage Transmission |
| 1 | Hillsboro |
| 2 | Hiram Sibley |
| 3 | History |
| 3 | Hollinger |
| 1 | Holtville |
| 3 | Home Telephone Company |
| 50 | Homer Brooke |
| 1 | Homes |
| 2 | Honesdale Glass Manufacturing Company |
| 1 | Honesdale, PA |
| 3 | Hook |
| 2 | Hoosac Tunnel |
| 1 | Hopewell Insulating and Manufacturing Company |
| 1 | Horn Insulator |
| 8 | House Insulator |
| 12 | Houston Glass Company |
| 14 | Houston Glass Works |
| 1 | Hudson Bay Company |
| 7 | Hudson Porcelain Company |
| 5 | Hudson River |
| 2 | I-T-E Circuit Breaker Company |
| 4 | I-T-E Imperial Corporation |
| 1 | I. W. Richardson |
| 1 | Idaho |
| 4 | Ideal Cleat |
| 1 | Illinois |
| 15 | Illinois Electric Porcelain Company |
| 175 | Imperial Porcelain Works |
| 2 | India |
| 1 | India Rubber |
| 1 | Indian Garden Manufacturing Company |
| 1 | Indian Telegraph |
| 1 | Indiana Gas Belt |
| 2 | Industrial Ceramics, Incorporated |
| 2 | Ingram |
| 1 | Inkstand |
| 41 | Insulator |
| 1 | Insulator Cement |
| 1 | Insulator Clamps |
| 1 | Insulator Cleaning |
| 1 | Insulator Company |
| 16 | Insulator Design |
| 1 | Insulator Glaze |
| 4 | Insulator Manufacture |
| 1 | Insulator Manufacturer |
| 1 | Insulator Problems |
| 25 | Insulator Testing |
| 1 | Insulator Trouble |
| 1 | Interborough Rapid Transit Company |
| 1 | International Oxygen Company |
| 1 | International Pottery Company |
| 1 | Internet |
| 126 | Interurban Railway |
| 2 | Investments |
| 2 | Ireland |
| 1 | Iron Pin |
| 8 | Iron-clad Insulator |
| 1 | Irradiation |
| 1 | Italian Insulator |
| 11 | Italy |
| 1 | J. A. Creighton |
| 1 | J. D. West & Company |
| 7 | J. H. Parker |
| 1 | J. J. Speed |
| 1 | J. S. Allen |
| 5 | Jack Waggoner |
| 2 | James C. Gill |
| 22 | James Foley |
| 4 | James H. Brookfield |
| 11 | James M. Brookfield |
| 1 | James Reid |
| 1 | James Stiff & Sons |
| 4 | Japan |
| 1 | Jay Gould |
| 18 | Jeffery-Dewitt Company |
| 38 | Jeffery-Dewitt Insulator Company |
| 3 | Jeffrey Manufacturing Company |
| 35 | Jeptha Wade |
| 1 | Jobson |
| 4 | John Barclay |
| 10 | John Boch |
| 3 | John C. Gray |
| 1 | John Crisp |
| 24 | John Croskey |
| 1 | John Fuller |
| 2 | John Lapp |
| 10 | John S. Lapp |
| 2 | John W. Boch |
| 2 | John Woodman |
| 1 | Johns-Manville |
| 7 | Johns-Pratt Company |
| 1 | Johnson |
| 33 | Johnson & Phillips |
| 1 | Johnston |
| 1 | Jonathan Coxon |
| 5 | Joseph A. Jeffery |
| 9 | Joseph Bourne & Son |
| 12 | Joseph Conway |
| 2 | Joseph Cook |
| 1 | Joseph Crossley |
| 1 | Joseph Jeffery |
| 1 | Joseph Ranson |
| 1 | Joslyn |
| 1 | Joslyn Manufacturing and Supply Company |
| 1 | Jumbo |
| 1 | Kaolin |
| 1 | Karlsbader Kaolin-Industrie-Gesellschaft |
| 1 | Keck |
| 13 | Kenosha Insulator Company |
| 9 | Kern River |
| 22 | Kerr Glass Manufacturing Corporation |
| 1 | Keystone Truss Pin |
| 2 | Kilgour |
| 6 | Kimble |
| 141 | Kimble Glass Company |
| 208 | King City Glass Works |
| 1 | King Insulating Company |
| 1 | Kleinsteuber Patent |
| 85 | Knapp Electrical Works |
| 50 | Knob |
| 4 | Knowles |
| 1 | Knowles, Taylor & Knowles |
| 4 | Knox Porcelain Company |
| 1 | Kohl |
| 11 | Kokomo Opalescent Glass Company |
| 2 | Kootenay |
| 1 | Kribs |
| 1 | Kryolite |
| 41 | L. G. Tillotson |
| 3 | L. P. Roberts |
| 1 | LaClede Carbon & Electric Company |
| 7 | Labor Organizations |
| 174 | Labor Relations |
| 2 | Labor Union |
| 1 | Lachine Rapids |
| 3 | Laclede Carbon & Electric Company |
| 1 | Lake Shore Electric Railway |
| 1 | Lamps |
| 4 | Langdon |
| 2 | Lansing, St. Johns and St. Louis Railway |
| 15 | Lapp Insulator Company |
| 1 | Lapp Insulators LLC |
| 12 | Latimer Clark |
| 14 | Lauffen-Frankfort |
| 52 | Lava Insulator |
| 2 | Lawrence Gray |
| 18 | Lefferts |
| 39 | Leonard Glass Works |
| 1 | Lewis Stillwell |
| 1 | Lightning |
| 3 | Lightning Arrester |
| 2 | Lightning Damage |
| 2 | Lightning Protection |
| 7 | Lightning Rod |
| 7 | Lightning Rod Balls |
| 12 | Lightning Rod Insulator |
| 55 | Lima Insulator Company |
| 3 | Line Construction |
| 4 | Line Material Company |
| 1 | Line Post |
| 11 | Llewellyn Matthews Hemingray |
| 5 | Local No. 23 |
| 1 | Locke |
| 1 | Locke 25; CD 242 |
| 1 | Locke Home |
| 1 | Locke Insulator Company |
| 4 | Locke Insulator Corporation |
| 262 | Locke Insulator Manufacturing Company |
| 2 | Locke Insulators, Incorporated |
| 1 | Lockport-Buffalo |
| 1 | Long Beach Glass Company |
| 1 | Long Island Flint Glass Works |
| 1 | Long Island Railroad |
| 1 | Louis Locke |
| 17 | Louis Steinberger |
| 2 | Louisville Glass Works |
| 1 | Lowell |
| 1 | Lowell Massachusetts |
| 1 | Luzerne Rubber Company |
| 22 | Lynchburg Glass Corporation |
| 64 | Lynchburg Glass Works |
| 42 | Lyndeboro Glass Company |
| 2 | Lyon |
| 3 | Lytle & Company |
| 1 | M&E |
| 1 | M-2011 |
| 7 | M-2121 |
| 2 | M-2122 |
| 1 | M-2123 |
| 1 | M-2141 |
| 5 | M-2150 |
| 1 | M-2202 |
| 1 | M-2220A |
| 1 | M-2221 |
| 3 | M-2230 |
| 1 | M-2254 |
| 1 | M-2275 |
| 5 | M-2332 |
| 2 | M-2336 |
| 1 | M-2401 |
| 1 | M-2402 |
| 6 | M-2430 |
| 1 | M-2470 |
| 1 | M-2505 |
| 2 | M-2740 |
| 1 | M-2750B |
| 2 | M-2785 |
| 29 | M-2795 |
| 3 | M-2796 |
| 1 | M-2842 |
| 1 | M-2942 |
| 1 | M-2996 |
| 8 | M-2998 |
| 1 | M-3022 |
| 5 | M-3060 |
| 1 | M-3062 |
| 2 | M-3065 |
| 4 | M-3070 |
| 1 | M-3110 |
| 1 | M-3150A |
| 1 | M-3161 |
| 1 | M-3170 |
| 2 | M-3230 |
| 1 | M-3236 |
| 1 | M-3240 |
| 10 | M-3250 |
| 4 | M-3285 |
| 1 | M-3401 |
| 1 | M-3440A |
| 1 | M-3450 |
| 1 | M-3451 |
| 1 | M-3452 |
| 1 | M-3465 |
| 1 | M-3471 |
| 1 | M-3472 |
| 1 | M-3490 |
| 1 | M-3530 |
| 2 | M-3721 |
| 1 | M-3721A |
| 33 | M-3725 |
| 1 | M-3735 |
| 16 | M-3740 |
| 1 | M-3800 |
| 9 | M-3890 |
| 1 | M-3900 |
| 1 | M-3940 |
| 1 | M-3950 |
| 2 | M-3990 |
| 1 | M-3XXX |
| 1 | M-4105 |
| 1 | M-4320 |
| 7 | M-4321 |
| 1 | M-4321A |
| 14 | M-4325 |
| 2 | M-4325A |
| 1 | M-4325C |
| 3 | M-4338 |
| 1 | M-4340 |
| 2 | M-4345 |
| 1 | M-4380 |
| 5 | M-4384 |
| 1 | M-4390 |
| 1 | M-4415 |
| 1 | M-4425 |
| 2 | M-4600 |
| 1 | M-4605 |
| 2 | M-4606 |
| 1 | M-4608 |
| 8 | M-4800 |
| 1 | M. Kirchberger & Company |
| 1 | M. M. Fleron and Son, Inc. |
| 6 | M. M. Wood |
| 1 | MILAN-PADERNO, ITALY |
| 1 | Macomb |
| 1 | Macomb Pottery Company |
| 1 | Maddock Pottery Co. |
| 1 | Maggie Hemingray Young |
| 2 | Maine |
| 1 | Maintenance |
| 2 | Manasquan |
| 36 | Manhattan Electrical Supply Company |
| 1 | Manhattan Railway Company |
| 8 | Marbles |
| 1 | Marlatt |
| 1 | Marmolite Insulator |
| 2 | Marriage |
| 3 | Marshall Lefferts |
| 6 | Martin Kalbfleisch |
| 1 | Mary Ann Carroll Hemingray |
| 35 | Mary Cross |
| 2 | Massachusetts |
| 5 | Massie |
| 50 | Matthews |
| 5 | McAbee |
| 102 | McBride Glass Company |
| 5 | McDonald Glass Hanger Board |
| 2 | McGraw Electric |
| 1 | McGrory |
| 1 | McGrory Insulator |
| 98 | McLaughlin Glass Company |
| 1 | McLeod, Ward & Company |
| 1 | Mechanicville |
| 7 | Medalta Potteries Ltd. |
| 15 | Medbery |
| 1 | Merson Type |
| 1 | Mexico |
| 2 | Mica Insulator |
| 68 | Mica Insulator Company |
| 1 | Micarta |
| 6 | Micarta-Core Insulator |
| 2 | Michigan |
| 1 | Michigan Porcelain Insulator Company |
| 1 | Milan-Paderno |
| 2 | Military |
| 2 | Military Telegraph |
| 1 | Mill Creek |
| 8 | Minerallac Electric Company |
| 2 | Minnesota |
| 4 | Minot K. Holmes |
| 4 | Miscellaneous |
| 5 | Missouri River Power Company |
| 8 | Mogadore Insulator Company |
| 1 | Mold |
| 1 | Mold Making |
| 3 | Molds |
| 2 | Montana Power Company |
| 3 | Montreal |
| 5 | Montreal Telegraph Company |
| 6 | Morse |
| 1 | Morton Harloe |
| 2 | Move to Muncie |
| 1 | Mrs. Robert Carroll Hemingray |
| 1 | Multicone Insulator |
| 5 | Muncie |
| 1 | NAPBG |
| 1 | NGK Insulators, Limited |
| 1 | NGK Insulators, Ltd |
| 1 | Nail Knob |
| 1 | Nancy Timberlake Hemingray |
| 9 | Nashold Cleat Company |
| 1 | National Ceramic Company |
| 1 | National China Company |
| 1 | National Convention |
| 8 | National Electric Porcelain Company |
| 4 | National Glass Company |
| 12 | National Glass Works |
| 38 | National Insulator Company |
| 7 | National Porcelain Company |
| 31 | Natural Gas |
| 1 | Necaxa, Mexico |
| 23 | Need Image |
| 1 | Nembro, Italy |
| 4 | Nester |
| 1 | Nesting-Cone |
| 1 | Nevada City |
| 1 | Nevada County |
| 1 | New |
| 1 | New Brunswick Porcelain Company |
| 1 | New England |
| 1 | New England Electric Company |
| 4 | New England Glass Manufacturing Company |
| 1 | New England Glass Works |
| 2 | New England Telephone & Telegraph Company |
| 2 | New Granite Glass Works |
| 2 | New Jersey |
| 88 | New Lexington High Voltage Porcelain Company |
| 1 | New Mexico |
| 1 | New Westminster & Burrard Inlet Telephone Company |
| 16 | New York |
| 5 | New Zealand |
| 1 | Newton Porcelain Company |
| 4 | Newtown Porcelain Works |
| 52 | Niagara |
| 3 | Niagara Falls |
| 15 | Niagara Falls Buffalo Transmission Line |
| 2 | Niagara Falls Power Company |
| 2 | Niagara Falls-Buffalo |
| 4 | Niagara, Lockport and Ontario Power Company |
| 1 | Niagara-Toronto |
| 3 | Nicholson |
| 4 | No-Leak |
| 11 | Noah Boch |
| 1 | Noeggerath |
| 1 | Non-Breakable Insulator Company |
| 7 | North American Glass Company |
| 1 | North American Telegraph Company |
| 2 | North Carolina |
| 1 | North Mountain |
| 1 | North Shore |
| 5 | Noti Insulator Company |
| 2 | Novelty Clay Forming Company |
| 100 | Novelty Glass Company |
| 1 | O'Neill Machine Company |
| 1 | Oakland Glass Works |
| 8 | Oakman |
| 15 | Oakman Manufacturing Company |
| 1 | Odd |
| 1 | Odd Insulator |
| 3 | Ogden |
| 1 | Ohio Brass |
| 111 | Ohio Brass Company |
| 5 | Ohio Insulator Company |
| 10 | Ohio Porcelain Company |
| 6 | Ohio River |
| 55 | Ohio Valley Glass Company |
| 1 | Oil |
| 11 | Oil Can |
| 46 | Oil Insulator |
| 2 | Old Insulator |
| 4 | Onondaga Pottery Company |
| 1 | Ontario |
| 12 | Ontario Glass Company |
| 2 | Oppenheimer Insulator |
| 5 | Oregon |
| 6 | Otis |
| 1 | Ottawa Glass Company |
| 2 | Overhead Construction |
| 1 | Overland Telegraph |
| 296 | Owens-Illinois Glass Company |
| 1 | P. E. M. CO. Knob |
| 2 | P. N. Nunn |
| 2 | Pacific Gas & Electric Company |
| 2 | Pacific Glass Casket Company |
| 1 | Pacific Glass Works |
| 4 | Pacific Pottery Company |
| 2 | Pacific Telegraph |
| 2 | Pacific and Atlantic Telegraph Company |
| 4 | Paderno |
| 6 | Paisley |
| 1 | Paiste |
| 1 | Paper Insulator |
| 2 | Paragon Self-Tying Knob |
| 2 | Paragon Sellers Company |
| 2 | Parker Porcelain Company |
| 1 | Partz Electric Company |
| 164 | Pass & Seymour |
| 131 | Patent |
| 5 | Patent Office |
| 1 | Patent Self-Binding Telegraph Insulator Company |
| 5 | Paul Seiler |
| 1 | Peerless Tree Insulator |
| 1 | Peirce |
| 3 | Peirce Specialty Company |
| 1 | Pell's Fluid Insulator |
| 7 | Pelzer |
| 31 | Pendleton Glass Tube & Pipe Works |
| 2 | Pennsylvania |
| 2 | Pennsylvania China Company |
| 29 | Pennycuick |
| 7 | Percival |
| 2 | Perfect |
| 9 | Perfection Glass Company |
| 2 | Perrine |
| 1 | Persian Telegraph |
| 105 | Peru Electric Manufacturing Company |
| 4 | Peru Glass & Carbon Works |
| 1 | Peru Glass and Carbon Company |
| 1 | Peru Porcelain Works |
| 1 | Peter Cooper |
| 1 | Pettingell-Andrews Company |
| 5 | Pettingill Andrews & Company |
| 1 | Pettingill-Andrews Company |
| 1 | Philadelphia |
| 1 | Philadelphia Insulator Company |
| 1 | Philip McAbee |
| 2 | Phillips |
| 1 | Phoenix Glass Company |
| 1 | Piano insulator |
| 3 | Pike's Peak |
| 20 | Pilkington Brothers, Ltd. |
| 68 | Pin |
| 1 | Pin Base |
| 8 | Pinco |
| 1 | Pinder Bourne |
| 1 | Pinder, Bourne & Company |
| 7 | Pins |
| 1 | Pioneer Glass Company |
| 3 | Pioneer Glass Works |
| 8 | Pittsburg High Voltage Insulator Company |
| 1 | Pittsburg Transformer Company |
| 7 | Pittsburg Voltage Insulator Company |
| 2 | Pittsburgh |
| 3 | Placerville & Humboldt Telegraph Company |
| 1 | Placerville Humboldt Telegraph |
| 16 | Pluto |
| 1 | Pogo |
| 2 | Poles |
| 15 | Political |
| 1 | Politics |
| 10 | Pomona |
| 7 | Pond |
| 1 | Poor Image |
| 7 | Pope |
| 37 | Porcelain |
| 1 | Porcelain Appliance Company |
| 1 | Porcelain Appliance Corporation |
| 5 | Porcelain Electric Manufacturing Company |
| 1 | Porcelain History |
| 36 | Porcelain Insulator |
| 4 | Porcelain Insulator Company |
| 36 | Porcelain Manufacture |
| 1 | Porcelain Problems |
| 2 | Porcelain Products Company |
| 4 | Porcelain Products, Incorporated |
| 8 | Porcelain vs Glass |
| 1 | Porzellanfabrik |
| 1 | Post Insulator |
| 1 | Postal |
| 9 | Postal Telegraph Company |
| 1 | Pot-Head |
| 1 | Pots |
| 1 | Pottery |
| 395 | Power Transmission |
| 1 | Price Fixing |
| 9 | Problems |
| 25 | Producer Gas |
| 9 | Products |
| 5 | Provo |
| 9 | Provo Insulator |
| 1 | Provo No. 1 |
| 2 | Prussian Insulator |
| 1 | Pseudoscience |
| 1 | Publications |
| 1 | Puyallup |
| 35 | Pyrex |
| 4 | Quebec |
| 1 | Queensland |
| 202 | R. Thomas & Sons Company |
| 6 | RFI |
| 19 | Radio Antenna Insulator |
| 2 | Radio Interference |
| 1 | Radio Treatment |
| 2 | Railway |
| 1 | Railway Crossing |
| 27 | Ralph Gray |
| 20 | Ralph Gray Hemingray |
| 26 | Ralph Mershon |
| 3 | Rams Horn |
| 2 | Randolph Insulator Company |
| 1 | Raquette River |
| 6 | Ravenswood Porcelain Company |
| 1 | Raw Materials |
| 5 | Real Estate |
| 14 | Reconstructed Granite Company |
| 1 | Red Insulators |
| 11 | Redlands |
| 3 | Refrigerator Bottle |
| 1 | Reid Brothers |
| 1 | Reminiscences |
| 1 | Reyburn, Hunter & Company |
| 2 | Richard Evans |
| 10 | Richard Ginori |
| 1 | Richard Thomas |
| 1 | Richardo Patent |
| 7 | Richardson |
| 1 | Richelieu Village |
| 2 | Richmond Glass Works |
| 1 | Riverside |
| 1 | Riverside, CA |
| 4 | Robert "Robin" Hemingray |
| 11 | Robert Carroll Hemingray |
| 17 | Robert Good |
| 15 | Robert Hemingray |
| 1 | Robert J Hemingray |
| 1 | Robert Jobsson |
| 1 | Robert McMicking |
| 3 | Robinson-Merrill Pottery Company |
| 1 | Rochester, Syracuse & Eastern Railroad |
| 83 | Rodefer |
| 1 | Rogers |
| 1 | Rome-Tivoli |
| 7 | Rosette |
| 4 | Royal E. House |
| 4 | Rubber |
| 14 | Rude |
| 1 | Rush Insulator |
| 1 | Russia |
| 1 | Russian |
| 1 | Russian Insulator |
| 10 | S. C. Dyke & Company |
| 6 | S. McKee & Company |
| 1 | Safety Insulator |
| 1 | Saint Gobain |
| 1 | Salamander Insulator |
| 12 | Salem Glass Company |
| 1 | Sales |
| 1 | Salesman Sample Insulator |
| 5 | Samuel F. B. Morse |
| 96 | Samuel Oakman |
| 1 | San Francisco & Pacific Glass Works |
| 4 | San Francisco Glass Works |
| 18 | San Francisco and Pacific Glass Works |
| 1 | San Joaquin Light and Power Company |
| 1 | San Joaquin Valley |
| 1 | Santa Ana Canyon |
| 1 | Sawsey |
| 2 | Schomburg |
| 1 | Schonberg |
| 1 | Schrage |
| 1 | Scott |
| 12 | Screw-top |
| 1 | Sea Weed Insulator |
| 5 | Seattle |
| 16 | Security Insulator Company |
| 1 | Sediver |
| 1 | Seims and Baker Brothers |
| 1 | Self-Tying |
| 10 | Self-Tying Insulator |
| 1 | Semenza |
| 1 | Shackle |
| 1 | Sharpe |
| 1 | Shaw China Company |
| 2 | Shaw Insulator Company |
| 1 | Shaw Pottery Company |
| 1 | Shawinigan |
| 4 | Shawinigan Falls |
| 15 | Shay, Stephens & Company |
| 26 | Shinkle |
| 2 | Shop |
| 1 | Shoshone |
| 11 | Siemens |
| 2 | Siemens Brothers & Company, Ltd. |
| 1 | Siemens, Halske & Co. |
| 1 | Signal Corp |
| 1 | Sillimanite |
| 1 | Silverton |
| 2 | Simonds |
| 4 | Simplest Cleat |
| 1 | Simplex Electrical Company |
| 2 | Simpson Foundry & Engineering Company |
| 1 | Single-Fire |
| 27 | Slater Lewis |
| 1 | Smith |
| 1 | Smith & Stone |
| 4 | Smith-Grip |
| 1 | Smith-Phillips China Company |
| 1 | Snoqualmie |
| 5 | Snoqualmie Falls |
| 6 | Snyder-Hunt Company |
| 3 | Social Event |
| 4 | Societa Ceramica Richard Ginori |
| 3 | South Carolina |
| 52 | Southern Porcelain Manufacturing Company |
| 4 | Southern Power Company |
| 3 | Southern Telegraph Company |
| 1 | Spain |
| 2 | Spanish Insulator |
| 1 | Spears |
| 1 | Specialty Porcelain Works |
| 1 | Spier Falls |
| 1 | Split Knob |
| 4 | Spokane |
| 2 | Sports |
| 2 | Spring River Power Company |
| 3 | Square D Company |
| 1 | St. John Glass Company |
| 1 | St. Lawrence River |
| 4 | St. Louis |
| 1 | St. Louis Malleable Casting Company |
| 5 | Standard China Works |
| 2 | Standard Electric Company |
| 13 | Standard Glass Insulator Company |
| 5 | Standard Porcelain Company |
| 1 | Standard Pottery Company |
| 3 | Standard Vitrified Conduit Company |
| 47 | Star Porcelain Company |
| 1 | Starr |
| 1 | Steatite Insulator |
| 1 | Steel Towers |
| 1 | Stephen M. Chester |
| 2 | Sterling Electric Company |
| 16 | Sterling Glass Company |
| 1 | Stewart McKee |
| 1 | Stiff & Son |
| 1 | Stillwell |
| 1 | Stockton, CA |
| 1 | Stone Insulators |
| 1 | Storm |
| 2 | Storm Damage |
| 2 | Strain |
| 24 | Strain Insulator |
| 2 | Street Light Hook |
| 2 | Street Railway Construction |
| 27 | Strike |
| 1 | String Telephone |
| 1 | Summit Porcelain Company |
| 2 | Sun Colored Amethyst |
| 5 | Sun Porcelain Company |
| 1 | Sunlight Lava Manufacturing Company |
| 1 | Super-Porcelain Insulator Company |
| 8 | Superior Porcelain Company |
| 1 | Surge |
| 5 | Susan Ashley |
| 4 | Susan Ashley Hemingray |
| 48 | Suspension |
| 9 | Suspension Insulator |
| 2 | Swasey |
| 1 | Sweden |
| 4 | Switzerland |
| 53 | Sydenham Glass Company |
| 1 | Sydenham Pottery |
| 1 | Syracuse |
| 1 | Syracuse, Lake Shore & Northern Railway |
| 1 | T. C. White Company |
| 2 | Tacoma |
| 3 | Taftville |
| 4 | Target Balls |
| 3 | Taylor Falls |
| 2 | Taylor, Tunnicliff & Company |
| 23 | Telegraph |
| 1 | Telegraph Line |
| 4 | Telegraph Lines |
| 1 | Telegraph Poles |
| 10 | Telephone |
| 2 | Telephone Construction |
| 1 | Telephone Insulator |
| 1 | Telephone Line Construction |
| 10 | Telluride |
| 5 | Telluride Power Company |
| 1 | Terra-Cotta Insulator |
| 3 | Testing |
| 5 | Thames Glass Works |
| 50 | Third Rail Insulator |
| 1 | Third Rail Insulators |
| 1 | Third-Rail Insulator |
| 1 | Thomas 6T |
| 1 | Thomas 9S |
| 84 | Thomas China Company |
| 1 | Thomas Davenport |
| 2 | Thomas Eckert |
| 2 | Thompson-Brown Electric Company |
| 4 | Thomson-Houston Electric Company |
| 1 | Three Rivers |
| 1 | Three Rivers, Quebec |
| 1 | Thuyer's Insulator |
| 1 | Tibbatts |
| 11 | Tid Bits |
| 3 | Tie Wire |
| 3 | Tiffin Pottery |
| 9 | Timberlake |
| 1 | Tireless Insulator Company |
| 1 | To Do |
| 1 | Tonawanda |
| 2 | Toronto |
| 20 | Torrance Glass & Color Works |
| 1 | Tower |
| 2 | Toys |
| 2 | Transandean Associates |
| 1 | Transcontinental Telegraph Company |
| 1 | Transformer |
| 2 | Transmission Line |
| 3 | Transposition |
| 44 | Tree Insulator |
| 4 | Trenle Porcelain Company |
| 2 | Trenton China Company |
| 1 | Trenton Fire Clay & Porcelain Company |
| 17 | Trenton Porcelain Company |
| 8 | Trenton Potteries Company |
| 1 | Triangle M |
| 1 | Trimble Patent Insulator Company |
| 1 | Trolley |
| 59 | Trolley Insulator |
| 1 | Trumbull Electric Manufacturing Company |
| 4 | Tube |
| 1 | Twiggs |
| 1 | Type C |
| 1 | Type E |
| 1 | U-1257 |
| 1 | U-1363 |
| 1 | U-1364 |
| 2 | U-146 |
| 2 | U-146A |
| 1 | U-183 |
| 1 | U-184 |
| 2 | U-192A |
| 1 | U-193 |
| 3 | U-196 |
| 1 | U-1966 |
| 1 | U-2028 |
| 2 | U-207C |
| 1 | U-212 |
| 1 | U-2840 |
| 1 | U-2841 |
| 2 | U-2911 |
| 2 | U-2914 |
| 1 | U-2918 |
| 1 | U-3 |
| 2 | U-376A |
| 1 | U-380 |
| 2 | U-4 |
| 4 | U-401 |
| 4 | U-401A |
| 1 | U-529A |
| 1 | U-585 |
| 1 | U-608A |
| 1 | U-610 |
| 2 | U-610A |
| 2 | U-648 |
| 2 | U-669 |
| 1 | U-670A |
| 1 | U-675A |
| 3 | U-701 |
| 1 | U-705 |
| 2 | U-710 |
| 2 | U-731A |
| 25 | U-744 |
| 14 | U-746 |
| 1 | U-81 |
| 1 | U-82 |
| 2 | U-922 |
| 1 | U-922A |
| 14 | U-923 |
| 1 | U-923A |
| 3 | U-923B |
| 14 | U-923C |
| 2 | U-923F |
| 1 | U-924 |
| 6 | U-925 |
| 1 | U-926 |
| 5 | U-927 |
| 4 | U-927A |
| 1 | U-927B |
| 18 | U-928 |
| 6 | U-928A |
| 2 | U-928B |
| 1 | U-930 |
| 2 | U-931A |
| 2 | U-932 |
| 1 | U-933 |
| 2 | U-933A |
| 16 | U-934 |
| 6 | U-935 |
| 8 | U-935A |
| 33 | U-937 |
| 1 | U-938 |
| 4 | U-939 |
| 2 | U-939A |
| 6 | U-940 |
| 1 | U-940B |
| 1 | U-940C |
| 1 | U-941 |
| 1 | U-941B |
| 3 | U-944 |
| 6 | U-945 |
| 1 | U-954D |
| 3 | U-957 |
| 1 | U-957A |
| 2 | U-961 |
| 2 | U-963 |
| 3 | U-964 |
| 1 | U-964B |
| 14 | U-966 |
| 1 | U-966A |
| 4 | U-966B |
| 1 | U-967 |
| 1 | U-967A |
| 1 | U-968 |
| 2 | U-968A |
| 5 | U-979 |
| 2 | U-98 |
| 5 | U-980 |
| 6 | U-981 |
| 2 | U-982 |
| 2 | U-983 |
| 4 | U. S. Electric Porcelain Company |
| 2 | Union |
| 1 | Union Electric Porcelain Company |
| 1 | Union Electrical Porcelain Company |
| 9 | Union Electrical Porcelain Works |
| 1 | Union Pacific Railway |
| 19 | Union Porcelain Works |
| 2 | United Glass and Ceramic Workers of North America |
| 1 | United States |
| 25 | United States Electric Porcelain Company |
| 38 | United States Glass Company |
| 1 | United States Insulator Company |
| 4 | United States Porcelain Company |
| 11 | United States Pottery Company |
| 7 | Unity Insulator |
| 3 | Universal Clay Products Company |
| 3 | Universal Specialty Company |
| 9 | Unknown |
| 1 | Unknown Porcelain Plant by Trenton Men |
| 6 | Utah |
| 1 | Vail |
| 54 | Valverde Glass Works |
| 6 | Vandalism |
| 21 | Varley |
| 1 | Victor Insulators |
| 19 | Victor Insulators, Incorporated |
| 3 | Victor Tree Insulator |
| 5 | Vidriera Monterey |
| 1 | Virginia |
| 4 | Virginia Matthews |
| 16 | Virginia Potteries Company |
| 1 | Vulcanite Mfg. Company |
| 1 | Wade Insulator |
| 1 | Wages |
| 33 | Wagner Glass Company |
| 6 | Wagner Glass Works |
| 2 | Waipori |
| 1 | Walker |
| 1 | Walker Mining & Manufacturing Company |
| 1 | Wall Bushing |
| 16 | Wall Tube |
| 1 | Walter T. Goddard |
| 2 | Wannopee Pottery Company |
| 1 | War |
| 1 | Ward Insulator |
| 3 | Warren Kimble |
| 14 | Washington |
| 4 | Washington Porcelain Company |
| 4 | Washington Pottery |
| 1 | Webb |
| 6 | Wedding |
| 1 | West Virginia Glass Works |
| 7 | Western Electric Company |
| 3 | Western Electric Manufacturing Company |
| 1 | Western Electrical Porcelain Company |
| 25 | Western Flint Glass Company |
| 1 | Western Glass Association |
| 79 | Western Glass Manufacturing Company |
| 2 | Western States Porcelain Company |
| 31 | Western Union Telegraph Company |
| 33 | Westinghouse |
| 1 | Westinghouse Electric Company |
| 35 | Westinghouse Glass Manufacturing Company |
| 4 | Westinghouse High Voltage Insulator Company |
| 1 | Westinghouse System |
| 2 | Wetern Union Telegraph Company |
| 3 | Wheeling Tile Company |
| 228 | Whitall Tatum Company |
| 1 | Whitall-Tatum Company |
| 1 | White Glaze |
| 2 | Whitney Glass Works |
| 1 | Willamette |
| 1 | Willamette Falls Electric Company |
| 1 | Willamette River |
| 1 | Willard P. Zimmerman |
| 2 | Willard Paul Zimmerman |
| 1 | Willets Manufacturing Company |
| 1 | William Brooke |
| 11 | William Brookfield |
| 5 | William Brunt |
| 48 | William Brunt Pottery Company |
| 28 | William Brunt and Company |
| 4 | William F. Modes |
| 2 | William H. Farrar |
| 1 | William J. Miller |
| 1 | William Miller Machinery |
| 1 | Winnepeg |
| 3 | Winnipeg |
| 1 | Winooski Vermont |
| 2 | Wirt |
| 3 | Wirt Manufacturing Company |
| 1 | Wisconsin |
| 1 | Witch's Hat Insulator |
| 1 | Wood |
| 1 | Wood Block |
| 1 | Wooden Cleat |
| 6 | Wooden Insulator |
| 2 | Woolbert Insulator |
| 3 | Worchester Polytechnic Institute |
| 4 | World's Fair |
| 47 | Wormser Glass Company |
| 1 | Yadkin River |
| 1 | Yandell |
| 1 | Yockel |
| 1 | Yuba River |
| 1 | Z. C. Robbins |
| 1 | Z. G. Simmons |
| 1 | Zurich |
| 3 | incomplete |
| 1 | 1909 Tariff Act |
| 3 | A. B. Chance Company |
| 2 | A. O. Austin |
| 1 | AC vs DC |
| 17 | AFGWU |
| 2 | Acme Porcelain Works |
| 10 | Adamant Porcelain Company |
| 1 | Aeromotor Company |
| 1 | Aetna Insulator |
| 9 | Ajax Line Material Company |
| 19 | Akron Hi-Potential Porcelain Company |
| 30 | Akron Insulator & Marble Company |
| 1 | Akron Marble Works |
| 1 | Akron Pottery Company |
| 7 | Akron Smoking Pipe Company |
| 1 | Akron Stone Marble Company |
| 1 | Akron Toy Company |
| 4 | Alberhill Coal and Clay Company |
| 22 | Albert & J. M. Anderson Company |
| 45 | Alley Glass Company |
| 1 | Allgemeine Elektricitaets-Gesellschaft |
| 1 | American Carbon Battery Company |
| 4 | American Electric Porcelain Company |
| 11 | American Insulator Company |
| 8 | American Iron Glass Pipe & Plate Company |
| 2 | American Lava Company |
| 10 | American Marble & Toy Manufacturing Company |
| 6 | American Marble Works |
| 1 | American Porcealain Company |
| 1 | American Porcelain Company |
| 1 | American Porcelain Works |
| 3 | American Union Telegraph Company |
| 1 | American Vitrified Conduit Company |
| 62 | Anacortes Glass Company |
| 2 | Anchor Electric Company |
| 2 | Anchor Pottery |
| 27 | Anderson Porcelain Company |
| 1 | Andrew's Insulator |
| 1 | Anglo-American Potteries |
| 3 | Angus Hibbard |
| 3 | Arc Light |
| 1 | Aries Brooke |
| 73 | Armstrong Cork Company |
| 6 | Arthur Watts |
| 2 | Artistic Porcelain Company |
| 1 | Atlantic and Pacific Telegraph Company |
| 4 | Atwood Faience Company |
| 13 | Aurora, Elgin & Chicago Railway |
| 4 | Australia |
| 20 | Australian Glass Manufacturing Company |
| 1 | Australian Porcelain Company |
| 1 | Babson Brothers Company |
| 2 | Bain Insulator |
| 1 | Bakelite |
| 1 | Ball Electric Light Company |
| 53 | Baltimore Glass Manufacturing Company |
| 42 | Baltimore and Ohio Telegraph Company |
| 16 | Barberton Pottery Company |
| 1 | Barnes & Kobert Manufacturing Company |
| 7 | Batchelder |
| 4 | Battery Insulator |
| 58 | Battery Jar |
| 4 | Baum |
| 21 | Bay State Glass Works |
| 2 | Beaver Falls Glass Company |
| 2 | Bed Insulator |
| 35 | Bell Pottery Company |
| 1 | Belleek Potteries |
| 2 | Bennett |
| 10 | Bennington Pottery |
| 2 | Bentley Plimpton |
| 3 | Berkshire Glass Sand Company |
| 2 | Bibber-White Company |
| 1 | Bird's Nest |
| 9 | Birmingham Glass Manufacturing Company |
| 1 | Bloomfield |
| 3 | Boch Patent |
| 6 | Boston Bottle Works |
| 6 | Boston Electric Light Company |
| 1 | Boston and Sandwich Glass Company |
| 4 | Bracket |
| 5 | Bradley A. Fiske |
| 3 | Bradley Fiske |
| 1 | Brent Mills |
| 14 | Brian Pottery Company |
| 5 | Bright's Insulator |
| 34 | Brilliant Glass Company |
| 8 | British Insulator |
| 2 | British Insulite Company |
| 1 | Brodie |
| 4 | Brodie Electric Company |
| 556 | Brookfield |
| 3 | Brookfield Catalog |
| 2 | Brookfield Family |
| 34 | Brookfield Glass Company |
| 1 | Brunt |
| 1 | Brunt Porcelain Company |
| 4 | Brunt Tile and Porcelain Company |
| 11 | Brunt and Thompson |
| 2 | Brush Electric Light Company |
| 1 | Bryant Electric Company |
| 1 | Buller & Co. |
| 1 | Bus Bar Insulator |
| 4 | Bushwick Glass Works |
| 7 | Buzby |
| 7 | C. S. Knowles |
| 1 | CD 283 |
| 1 | Cable Insulator Company |
| 89 | Cadiz Glass Company |
| 22 | California Electrical Works |
| 171 | California Glass Insulator Company |
| 2 | California Glass Works |
| 1 | Callaway County Clay Company |
| 8 | Cambridge Electric Light Company |
| 1 | Canada |
| 2 | Canada Glass Company |
| 1 | Canada Glass Corporation |
| 4 | Canadian Glass Manufacturing Company |
| 1 | Canadian Niagara Power Company |
| 3 | Canadian Pacific Railway Company |
| 3 | Canadian Pacific Telegraph |
| 2 | Canadian Porcelain Company |
| 7 | Canton Insulator & Clay Company |
| 3 | Carey Ohio Porcelain Company |
| 2 | Cassius Alley |
| 1 | Catenary |
| 1 | Central District & Printing Telegraph Company |
| 3 | Central Electric Company |
| 3 | Central Porcelain Works |
| 1 | Ceramic Electrical Company |
| 3 | Ceramic Products Corporation |
| 4 | Chambers |
| 2 | Champion Porcelain Company |
| 1 | Charles Howell Cook |
| 1 | Charles Kimble |
| 13 | Charles T. Chester |
| 2 | Charles Tigner |
| 9 | Chelsea Pottery |
| 2 | Chesapeake and Potomac Telephone Company |
| 1 | Cheshire Glass Manufacturing Company |
| 39 | Chicago Insulating Company |
| 1 | Chicago, Lake Shore and South Bend Railway |
| 2 | Citizen's Electric Light Company |
| 1 | Civil War |
| 1 | Clark Electric & Manufacturing Company |
| 1 | Clay Forming Company |
| 1 | Clay Products Company |
| 23 | Cleat |
| 2 | Cleveland Paper Insulator |
| 1 | Climax Porcelain Company |
| 1 | Climax Pottery Company |
| 1 | Clincho |
| 1 | Cloche-Mehun Insulator |
| 1 | Cohansey Glass Company |
| 13 | Collins Overland Telegraph |
| 7 | Colonial Sign & Insulator Company |
| 2 | Colonial Sign Company |
| 2 | Colophite Manufacturing Company |
| 3 | Columbia Insulator Company |
| 1 | Communication Equipment and Engineering Company |
| 1 | Composition Insulator |
| 1 | Connecticut Electric Manufacturing Company |
| 5 | Conover Insulator Company |
| 6 | Consolidated Electric Light Company |
| 3 | Consumers Insulator Company |
| 6 | Cook Porcelain Insulator Corporation |
| 18 | Cook Pottery Company |
| 1 | Cooke & Wilson Company |
| 1 | Cooke-Wilson Electric Supply Company |
| 3 | Coors Porcelain Company |
| 268 | Corning Glass Works |
| 1 | Corwico |
| 1 | Covington Glass Company |
| 11 | Creaghead Engineering Company |
| 2 | Cromwell Fleetwood Varley |
| 5 | Crouse-Hinds Electric Company |
| 16 | Cryolite |
| 33 | Crystal Glass Company |
| 1 | Crystal Glass Manufacturing Company |
| 2 | Crystal Porcelain Company |
| 32 | Crystalite Products Corporation |
| 1 | Curry-McQuilken Company |
| 2 | Cutter |
| 133 | D. C. Jenkins Glass Company |
| 46 | D. M. Steward Manufacturing Company |
| 112 | David Brooks |
| 3 | Davidson & Stevenson Porcelain Company |
| 7 | Davidson Porcelain Company |
| 1 | Dead-end Spool |
| 20 | Denver |
| 2 | Derry China Company |
| 2 | Deseret Telegraph Company |
| 34 | Detroit Electrical Works |
| 62 | Diamond Flint Glass Company |
| 73 | Diamond Glass Company |
| 1 | Dielectrine |
| 1 | Dirigo |
| 234 | Dominion Glass Company |
| 2 | Dominion Insulator & Manufacturing Company |
| 1 | Dry Spot Insulator |
| 10 | Dunton & Field |
| 18 | Duquesne Glass Company |
| 8 | Dyke |
| 2 | Dyke Marble and Toy Works |
| 2 | E. G. Bernard Company |
| 1 | E. L. Insulator |
| 9 | E. S. Greeley & Company |
| 1 | Eagle Porcelain Company |
| 8 | Eagle Pottery Company |
| 2 | East End Pottery Company |
| 1 | East Liverpool |
| 2 | East Liverpool Potteries Company |
| 2 | Edison |
| 3 | Electric Appliance Company |
| 23 | Electric Porcelain & Manufacturing Company |
| 10 | Electric Porcelain Company |
| 2 | Electric Storage Battery Company |
| 19 | Electrical Construction & Maintenance Company |
| 2 | Electrical Exhibitions |
| 19 | Electrical Glass Corporation |
| 1 | Electrical Glassware |
| 3 | Electrical Insulator Manufacturing Company |
| 2 | Electrical Porcelain |
| 29 | Electrical Porcelain Company |
| 1 | Electrical Porcelain Products Company |
| 36 | Electrical Supply Company Chicago |
| 27 | Electrose Manufacturing Company |
| 28 | Ellenville Glass Works |
| 3 | Elliott |
| 22 | Elmer Glass Company |
| 1 | Emminger |
| 13 | Empire China Works |
| 1 | Etho Insulator |
| 4 | Etruria Pottery |
| 2 | Everready Porcelain Company |
| 1 | Excelsior Glass Company |
| 3 | Ezra Cornell |
| 1 | Fairmount |
| 1 | Farmer |
| 4 | Fay Clamp |
| 4 | Federal Porcelain Company |
| 2 | Feeder Insulator |
| 1 | Fernando C. Mesa Company |
| 15 | Fiberite Company |
| 12 | Findlay Electric Porcelain Company |
| 4 | Findlay Glass and Carbon Company |
| 5 | Fire |
| 1 | Fireplug |
| 1 | First Insulator |
| 4 | Fisher Electric Company |
| 2 | Fiske-Mott |
| 1 | Fletcher Insulator |
| 3 | Floor Insulator |
| 1 | Floor Tubes |
| 1 | Fog-Type |
| 1 | Folsom |
| 72 | Foree Bain |
| 86 | Foreign |
| 1 | Foreign Glass |
| 13 | Foreign Insulator |
| 6 | Foreign Porcelain |
| 14 | Frank Fisher |
| 3 | Frank Riddle |
| 213 | Fred Locke |
| 1 | Fred M. Locke |
| 1 | Frederic Duggan |
| 2 | Frederic Gisborne |
| 1 | Freeman Electric Company |
| 3 | Freeman Electric Porcelain Company |
| 1 | Frenchtown Porcelain Company |
| 2 | Fuel |
| 2 | Fuseholder |
| 15 | G. F. Brunt Porcelain Company |
| 1 | Garrity |
| 200 | Gayner Glass Works |
| 256 | General |
| 22 | General Electric Company |
| 13 | General Porcelain Company |
| 7 | George Brunt |
| 2 | Gilbert |
| 1 | Gisborne |
| 1 | Gladding Ceramic Insulator Company |
| 2 | Glass |
| 1 | Glass Block |
| 31 | Glass Conduits |
| 2 | Glass Industry |
| 27 | Glass Insulator |
| 1 | Glass Knob |
| 1 | Glass Ring |
| 1 | Glass additives |
| 1 | Glaze color |
| 4 | Gleason-Tiebout Glass Company |
| 11 | Globe Pottery Company |
| 1 | Goodyear |
| 5 | Goodyear Vulcanite Company |
| 1 | Gordon Battery Company |
| 16 | Gould & Watson Company |
| 5 | Gould, Inc. |
| 1 | Gravity Insulator |
| 3 | Greenwood China Company |
| 7 | Greenwood Pottery Company |
| 1 | Gustafsberg Pottery |
| 265 | H. C. Fry Glass Company |
| 1 | H. D. Murdock |
| 2 | H. E. Swift Manufacturing Company |
| 3 | H. H. Cochrane |
| 1 | H. L. China Company |
| 92 | H. T. Paiste |
| 58 | H. W. Johns Manufacturing Company |
| 52 | H. W. Johns-Manville Company |
| 4 | Hamilton Glass Company |
| 23 | Hammond Cleat & Insulator Company |
| 76 | Hardware |
| 62 | Harloe Insulator Company |
| 11 | Hartford Faience Company |
| 5825 | Hemingray |
| 877 | Hemingray Family |
| 623 | Hemingray Glass Company |
| 1 | Hemingray, Joseph C. |
| 1 | Hemingray, Robert |
| 2 | Hemming Manufacturing Company |
| 1 | Hendee |
| 6 | Henry Brunt |
| 3 | Henry Brunt and Son |
| 14 | Henry Floy |
| 2 | Henry M. Byllesby |
| 1 | Hetherington Insulator |
| 2 | Hewlett |
| 1 | High-Tension Line Construction |
| 1 | High-Voltage Transmission |
| 2 | Hiram Sibley |
| 3 | Home Telephone Company |
| 46 | Homer Brooke |
| 2 | Honesdale Glass Manufacturing Company |
| 1 | Hoosac Tunnel |
| 1 | Horn Insulator |
| 3 | House Insulator |
| 12 | Houston Glass Company |
| 2 | Houston Glass Works |
| 7 | Hudson Porcelain Company |
| 1 | I-T-E Circuit Breaker Company |
| 1 | I-T-E Imperial Corporation |
| 9 | Illinois Electric Porcelain Company |
| 109 | Imperial Porcelain Works |
| 1 | India Rubber |
| 1 | Indian Garden Manufacturing Company |
| 1 | Indian Telegraph |
| 1 | Industrial Ceramics, Incorporated |
| 1 | Inkstand |
| 40 | Insulator |
| 1 | Insulator Cement |
| 1 | Insulator Cleaning |
| 1 | Insulator Company |
| 14 | Insulator Design |
| 1 | Insulator Glaze |
| 1 | Insulator Manufacturer |
| 1 | Insulator Problems |
| 20 | Insulator Testing |
| 1 | Insulator Trouble |
| 1 | Internet |
| 21 | Interurban Railway |
| 1 | Iron Pin |
| 2 | Iron-clad Insulator |
| 1 | J. A. Creighton |
| 1 | J. H. Parker |
| 1 | J. J. Speed |
| 1 | J. S. Allen |
| 4 | James H. Brookfield |
| 6 | James M. Brookfield |
| 1 | James Reid |
| 1 | James Stiff & Sons |
| 1 | Jay Gould |
| 6 | Jeffery-Dewitt Company |
| 26 | Jeffery-Dewitt Insulator Company |
| 2 | Jeffrey Manufacturing Company |
| 14 | Jeptha Wade |
| 4 | John Barclay |
| 4 | John Boch |
| 7 | John Croskey |
| 1 | John Fuller |
| 1 | John Lapp |
| 7 | John S. Lapp |
| 1 | John W. Boch |
| 1 | John Woodman |
| 7 | Johns-Pratt Company |
| 1 | Johnson |
| 13 | Johnson & Phillips |
| 1 | Johnston |
| 4 | Joseph Bourne & Son |
| 1 | Joseph Crossley |
| 1 | Joseph Jeffery |
| 1 | Joseph Ranson |
| 3 | Kenosha Insulator Company |
| 21 | Kerr Glass Manufacturing Corporation |
| 1 | Keystone Truss Pin |
| 206 | King City Glass Works |
| 81 | Knapp Electrical Works |
| 24 | Knob |
| 1 | Knowles, Taylor & Knowles |
| 4 | Knox Porcelain Company |
| 11 | Kokomo Opalescent Glass Company |
| 1 | Kribs |
| 34 | L. G. Tillotson |
| 3 | L. P. Roberts |
| 1 | LaClede Carbon & Electric Company |
| 7 | Labor Organizations |
| 7 | Labor Relations |
| 3 | Laclede Carbon & Electric Company |
| 1 | Lake Shore Electric Railway |
| 1 | Langdon |
| 12 | Lapp Insulator Company |
| 1 | Lapp Insulators LLC |
| 5 | Latimer Clark |
| 10 | Lauffen-Frankfort |
| 1 | Lava Insulator |
| 1 | Lawrence Gray |
| 9 | Lefferts |
| 14 | Leonard Glass Works |
| 1 | Lewis Stillwell |
| 2 | Lightning Damage |
| 1 | Lightning Protection |
| 5 | Lightning Rod |
| 4 | Lightning Rod Balls |
| 9 | Lightning Rod Insulator |
| 33 | Lima Insulator Company |
| 3 | Line Construction |
| 1 | Locke 25; CD 242 |
| 155 | Locke Insulator Manufacturing Company |
| 1 | Long Island Railroad |
| 2 | Louis Steinberger |
| 2 | Louisville Glass Works |
| 1 | Luzerne Rubber Company |
| 18 | Lynchburg Glass Corporation |
| 43 | Lynchburg Glass Works |
| 41 | Lyndeboro Glass Company |
| 1 | M-2150 |
| 1 | M. Kirchberger & Company |
| 1 | Macomb |
| 1 | Maintenance |
| 35 | Manhattan Electrical Supply Company |
| 1 | Marbles |
| 1 | Marlatt |
| 3 | Marshall Lefferts |
| 4 | Martin Kalbfleisch |
| 102 | McBride Glass Company |
| 1 | McGraw Electric |
| 95 | McLaughlin Glass Company |
| 7 | Medalta Potteries Ltd. |
| 1 | Mica Insulator |
| 67 | Mica Insulator Company |
| 1 | Micarta |
| 1 | Michigan Porcelain Insulator Company |
| 2 | Military Telegraph |
| 5 | Minerallac Electric Company |
| 4 | Miscellaneous |
| 2 | Mogadore Insulator Company |
| 5 | Montreal Telegraph Company |
| 1 | Morton Harloe |
| 1 | NAPBG |
| 1 | Nail Knob |
| 7 | Nashold Cleat Company |
| 1 | National China Company |
| 3 | National Electric Porcelain Company |
| 2 | National Glass Company |
| 1 | National Glass Works |
| 27 | National Insulator Company |
| 1 | National Porcelain Company |
| 1 | New Brunswick Porcelain Company |
| 1 | New England Electric Company |
| 4 | New England Glass Manufacturing Company |
| 2 | New England Telephone & Telegraph Company |
| 2 | New Granite Glass Works |
| 65 | New Lexington High Voltage Porcelain Company |
| 1 | New Westminster & Burrard Inlet Telephone Company |
| 1 | New Zealand |
| 1 | Newton Porcelain Company |
| 1 | Newtown Porcelain Works |
| 6 | Niagara |
| 1 | Niagara Falls |
| 6 | Niagara Falls Buffalo Transmission Line |
| 8 | Noah Boch |
| 1 | Non-Breakable Insulator Company |
| 5 | North American Glass Company |
| 1 | North American Telegraph Company |
| 5 | Noti Insulator Company |
| 1 | Novelty Clay Forming Company |
| 87 | Novelty Glass Company |
| 1 | Oakland Glass Works |
| 1 | Oakman |
| 1 | Oakman Manufacturing Company |
| 1 | Odd Insulator |
| 80 | Ohio Brass Company |
| 2 | Ohio Insulator Company |
| 1 | Ohio Porcelain Company |
| 50 | Ohio Valley Glass Company |
| 17 | Oil Insulator |
| 2 | Old Insulator |
| 9 | Ontario Glass Company |
| 2 | Oppenheimer Insulator |
| 2 | Otis |
| 1 | Ottawa Glass Company |
| 2 | Overhead Construction |
| 22 | Owens-Illinois Glass Company |
| 2 | P. N. Nunn |
| 1 | Pacific Glass Works |
| 4 | Pacific Pottery Company |
| 2 | Pacific Telegraph |
| 6 | Paisley |
| 1 | Paper Insulator |
| 2 | Paragon Self-Tying Knob |
| 145 | Pass & Seymour |
| 1 | Patent |
| 2 | Paul Seiler |
| 2 | Pennsylvania China Company |
| 7 | Pennycuick |
| 9 | Perfection Glass Company |
| 1 | Persian Telegraph |
| 92 | Peru Electric Manufacturing Company |
| 4 | Peru Glass & Carbon Works |
| 4 | Pettingill Andrews & Company |
| 1 | Philadelphia Insulator Company |
| 1 | Phillips |
| 1 | Piano insulator |
| 20 | Pilkington Brothers, Ltd. |
| 6 | Pin |
| 6 | Pinco |
| 1 | Pinder, Bourne & Company |
| 1 | Pins |
| 2 | Pioneer Glass Works |
| 6 | Pittsburg High Voltage Insulator Company |
| 1 | Pittsburg Transformer Company |
| 7 | Pittsburg Voltage Insulator Company |
| 1 | Pluto |
| 1 | Pogo |
| 2 | Poles |
| 2 | Pomona |
| 4 | Pond |
| 3 | Pope |
| 14 | Porcelain |
| 1 | Porcelain Appliance Company |
| 1 | Porcelain Appliance Corporation |
| 2 | Porcelain Electric Manufacturing Company |
| 27 | Porcelain Insulator |
| 4 | Porcelain Insulator Company |
| 23 | Porcelain Manufacture |
| 1 | Porcelain Problems |
| 3 | Porcelain Products, Incorporated |
| 6 | Porcelain vs Glass |
| 8 | Postal Telegraph Company |
| 1 | Pottery |
| 359 | Power Transmission |
| 1 | Publications |
| 100 | R. Thomas & Sons Company |
| 6 | RFI |
| 4 | Radio Antenna Insulator |
| 2 | Radio Interference |
| 2 | Railway |
| 14 | Ralph Mershon |
| 1 | Rams Horn |
| 2 | Randolph Insulator Company |
| 2 | Ravenswood Porcelain Company |
| 8 | Reconstructed Granite Company |
| 1 | Red Insulators |
| 2 | Redlands |
| 2 | Richard Ginori |
| 1 | Richard Thomas |
| 2 | Richmond Glass Works |
| 8 | Robert Good |
| 1 | Robert Jobsson |
| 1 | Robert McMicking |
| 1 | Robinson-Merrill Pottery Company |
| 77 | Rodefer |
| 2 | Rosette |
| 3 | Royal E. House |
| 1 | Rubber |
| 1 | Rush Insulator |
| 7 | S. C. Dyke & Company |
| 4 | S. McKee & Company |
| 1 | Safety Insulator |
| 1 | Salamander Insulator |
| 12 | Salem Glass Company |
| 4 | Samuel F. B. Morse |
| 78 | Samuel Oakman |
| 4 | San Francisco Glass Works |
| 14 | San Francisco and Pacific Glass Works |
| 12 | Screw-top |
| 1 | Sea Weed Insulator |
| 15 | Security Insulator Company |
| 3 | Self-Tying Insulator |
| 1 | Sharpe |
| 1 | Shaw Insulator Company |
| 15 | Shay, Stephens & Company |
| 1 | Siemens |
| 1 | Siemens Brothers & Company, Ltd. |
| 1 | Signal Corp |
| 1 | Simonds |
| 1 | Simplest Cleat |
| 1 | Simplex Electrical Company |
| 12 | Slater Lewis |
| 1 | Smith & Stone |
| 1 | Smith-Grip |
| 1 | Smith-Phillips China Company |
| 2 | Snyder-Hunt Company |
| 2 | Societa Ceramica Richard Ginori |
| 50 | Southern Porcelain Manufacturing Company |
| 3 | Southern Telegraph Company |
| 1 | Spears |
| 2 | Square D Company |
| 1 | St. John Glass Company |
| 3 | Standard China Works |
| 12 | Standard Glass Insulator Company |
| 2 | Standard Porcelain Company |
| 1 | Standard Pottery Company |
| 2 | Standard Vitrified Conduit Company |
| 31 | Star Porcelain Company |
| 1 | Steatite Insulator |
| 1 | Stephen M. Chester |
| 2 | Sterling Electric Company |
| 15 | Sterling Glass Company |
| 1 | Storm Damage |
| 9 | Strain Insulator |
| 2 | Strike |
| 1 | Summit Porcelain Company |
| 2 | Sun Colored Amethyst |
| 3 | Sun Porcelain Company |
| 1 | Sunlight Lava Manufacturing Company |
| 1 | Super-Porcelain Insulator Company |
| 5 | Superior Porcelain Company |
| 10 | Suspension |
| 3 | Suspension Insulator |
| 48 | Sydenham Glass Company |
| 1 | T. C. White Company |
| 1 | Target Balls |
| 1 | Taylor, Tunnicliff & Company |
| 18 | Telegraph |
| 1 | Telegraph Line |
| 1 | Telegraph Lines |
| 1 | Telegraph Poles |
| 3 | Telephone |
| 2 | Telephone Construction |
| 1 | Telephone Insulator |
| 1 | Telephone Line Construction |
| 2 | Telluride |
| 2 | Telluride Power Company |
| 1 | Terra-Cotta Insulator |
| 5 | Thames Glass Works |
| 25 | Third Rail Insulator |
| 79 | Thomas China Company |
| 1 | Thomas Davenport |
| 2 | Thomas Eckert |
| 2 | Thomson-Houston Electric Company |
| 1 | Thuyer's Insulator |
| 3 | Tid Bits |
| 1 | Tireless Insulator Company |
| 1 | To Do |
| 20 | Torrance Glass & Color Works |
| 2 | Transandean Associates |
| 2 | Transmission Line |
| 22 | Tree Insulator |
| 2 | Trenle Porcelain Company |
| 11 | Trenton Porcelain Company |
| 2 | Trenton Potteries Company |
| 1 | Trolley |
| 27 | Trolley Insulator |
| 1 | Trumbull Electric Manufacturing Company |
| 1 | Twiggs |
| 1 | U-937 |
| 1 | U. S. Electric Porcelain Company |
| 5 | Union Electrical Porcelain Works |
| 14 | Union Porcelain Works |
| 7 | United States Electric Porcelain Company |
| 38 | United States Glass Company |
| 1 | United States Insulator Company |
| 1 | United States Porcelain Company |
| 5 | United States Pottery Company |
| 3 | Universal Clay Products Company |
| 2 | Universal Specialty Company |
| 5 | Unknown |
| 1 | Unknown Porcelain Plant by Trenton Men |
| 23 | Valverde Glass Works |
| 4 | Vandalism |
| 6 | Varley |
| 7 | Victor Insulators, Incorporated |
| 2 | Vidriera Monterey |
| 5 | Virginia Potteries Company |
| 1 | Vulcanite Mfg. Company |
| 28 | Wagner Glass Company |
| 1 | Walker Mining & Manufacturing Company |
| 1 | Wall Bushing |
| 8 | Wall Tube |
| 2 | Wannopee Pottery Company |
| 1 | Ward Insulator |
| 1 | Warren Kimble |
| 4 | Washington Porcelain Company |
| 3 | Washington Pottery |
| 1 | West Virginia Glass Works |
| 4 | Western Electric Company |
| 3 | Western Electric Manufacturing Company |
| 1 | Western Electrical Porcelain Company |
| 24 | Western Flint Glass Company |
| 1 | Western Glass Association |
| 78 | Western Glass Manufacturing Company |
| 2 | Western States Porcelain Company |
| 6 | Western Union Telegraph Company |
| 21 | Westinghouse |
| 1 | Westinghouse Electric Company |
| 35 | Westinghouse Glass Manufacturing Company |
| 2 | Westinghouse High Voltage Insulator Company |
| 171 | Whitall Tatum Company |
| 1 | Willets Manufacturing Company |
| 1 | William Brooke |
| 6 | William Brookfield |
| 1 | William Brunt |
| 39 | William Brunt Pottery Company |
| 3 | William F. Modes |
| 2 | William H. Farrar |
| 1 | Wooden Cleat |
| 4 | Wooden Insulator |
| 2 | Woolbert Insulator |
| 1 | Worchester Polytechnic Institute |
| 3 | World's Fair |
| 43 | Wormser Glass Company |
| 1 | Yandell |
| 1 | Yockel |
| 1 | Z. C. Robbins |