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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 = '156') AND (category.subclass = '556') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '156'; Subclass is '556';

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T / S Patent Date Description Patentee Category Assigned To
 1928
U 1,677,294 July 17, 1928 Insulator Assembly Jig
Centering jig for assembling multipart porcelain insulators
ROBERTSON, John Cullen
Manufacturing Locke Insulator Corp.

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