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 = '29') AND (category.subclass = '521') ORDER BY specimen ASC, date, patent, type |
Total of 2 patents found where: Class is '29'; Subclass is '521';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1927 | ||||||
U | 1,625,266 | April 19, 1927 | Rod Coupling Lightning rod made solid with parallel fins and connected by coupling with matching male and female threads crimped over the ends of the rod sections |
MAST, Charles O. |
Lightning Rod Coupling | Mast Lightning Rod Co. |
1928 | ||||||
U | 1,685,834 | October 2, 1928 | Process of Manufacturing Insulator Pins Manufacturing method to make steel pins for wooden crossarms |
AUSTIN, Arthur O. |
Manufacturing | The Ohio Brass Co. |
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