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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 = '51') ORDER BY date ASC, patent, type

Total of 4 patents found where: Class is '51';

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T / S Patent Date Description Patentee Category Assigned To
 1870
U 108,408 October 18, 1870 Improvement in Cutting and Engraving Stone, Metal, Glass &c.
Method of sandblashing to cut or engrave		 TILGHMAN, Benjamin C.
 Engraving  
 1912
U 1,049,005 December 31, 1912 Insulating Composition and Process of Making the Same
Artificial reconstructed lava made from combining soapstone or talc (hydrated silicate of magnesia), with a binder which is the precipitate of a mixture of magnesium sulfate and sodium silicate. The combination is then molded to the desired shape and fired at 1000 to 1300 degrees centigrade or higher.		 STEINMETZ, Charles P.
 Composition General Electric Co.
 1914
U Specimen known 1,091,678 March 31, 1914 Insulating Composition
Boro-silicate glass		 LOCKE, Fred M.
 Boron  
U Specimen known 1,091,679 March 31, 1914 Insulator
Boro-silicate glass		 LOCKE, Fred M.
 Boron  

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