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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '313') AND (category.subclass = '313') ORDER BY date ASC, patent, type

Total of 4 patents found where: Class is '313'; Subclass is '313';

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T / S Patent Date Description Patentee Category Assigned To
 1919
U 1,303,324 May 13, 1919 Electric Insulator
Suspension tubular insulator with flanged top metal cap and bottom metal cap		 JACKSON, Ray P.
 Suspension Westinghouse Electric & Mfg. Co.
 1924
U 1,501,732 July 15, 1924 Column Strain Insulator
Electrose strain insulator		 STEINBERGER, Louis
 Strain  
 1925
U Specimen known 1,552,664 September 8, 1925 Insulator
Suspension arcing horn insulator (see 1,521,743 and 1,783,271)		 AUSTIN, Arthur O.
 Suspension The Ohio Brass Co.
 1934
U 1,983,903 December 11, 1934 Protective Apparatus for Double String Installations
Arcing rings for a double string of suspension insulators		 HAWLEY, Kent A.
 Arcing Ring Locke Insulator Corp.

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