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 = '439') AND (category.subclass = '531') ORDER BY type ASC, date, patent |
Total of 1 patents found where: Class is '439'; Subclass is '531';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1909 | ||||||
U | 934,463 | September 21, 1909 | Cleat for Electric Wires Cleat for ceiling wires and fixtures |
RITTER, William F. |
Cleat |
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