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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 = '151') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '174'; Subclass is '151';

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T / S Patent Date Description Patentee Category Assigned To
U 615,896 December 13, 1898 Vacuum Insulator for Electric Conductors
Wall tube sealed in vacuum and protected from weather (see 608,906)
POCHE, Joseph Arthur
Wall Tube  
U 698,097 April 22, 1902 Electrical Insulator
Bushing and bracket to support conductor cable
BALL, Henry Price
Bushing General Incandescent Light Co.
U 979,840 December 27, 1910 Insulator Base
Insulator base to support a high voltage insulator on a building roof to allow the conductor to enter the roof
GODDARD, Walter T.
Insulator Base Locke Insulator Mfg. Co.

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