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 = '269') AND (category.subclass = '257') ORDER BY category ASC, date, patent, type |
Total of 1 patents found where: Class is '269'; Subclass is '257';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
Manufacturing | ||||||
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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