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 = '2') ORDER BY date ASC, patent, type |
Total of 1 patents found where: Class is '2';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1877 | ||||||
U | 186,877 | January 30, 1877 | Improvement in Lightning Rod Couplings Coupling made with square socket that is crimped over end of lightning rod and has threaded bolt end to screw into next section |
REYBURN, William S. MARTIN, Frederick J. |
Lightning Rod Coupling |
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