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 = '57') AND (category.subclass = '13') ORDER BY type DESC, date, patent |
Total of 1 patents found where: Class is '57'; Subclass is '13';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1874 | ||||||
U | 156,713 | November 10, 1874 | Improvement in Machines for Making Tubular Lightning Rods Machine for making lightning rods by make metal tubes from sheet metal and wrapping the tubes around a central core |
SCHOONMAKER, John C. |
Lightning Rod Machine |
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