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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 = '493') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '493';

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T / S Patent Date Description Patentee Category Assigned To
U 1,159,798 November 9, 1915 Insulating Tube
Tubes (insulating) made by winding long strips of paper (machine for making)
Wall Tube Westinghouse Electric & Mfg. Co.

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