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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 = '174') AND (category.subclass = '31.5') ORDER BY date ASC, patent, type

Total of 4 patents found where: Class is '174'; Subclass is '31.5';

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T / S Patent Date Description Patentee Category Assigned To
U 461,631 October 20, 1891 Insulating Support for Electric Conductors
Oil insulator
HEWETT, Robert J.
U Specimen known 524,659 August 14, 1894 Insulator
Oil cup with means to support the cup from the insulator (see 517,634)
WINSLOW, George H.
U 771,297 October 4, 1904 Insulator
Oil reservoir for transformer insulator
CHESNEY, Cummings C.
Oil Stanley Electric Mfg. Co.
U Specimen known 1,190,766 July 11, 1916 Insulating Support
Battery support insulator
HUBBARD, Albert S.
Battery Gould Storage Battery Co.

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