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 = '335') AND (category.subclass = '181') ORDER BY type ASC, date, patent |
Total of 1 patents found where: Class is '335'; Subclass is '181';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1867 | ||||||
U | 69,585 | October 8, 1867 | Improvement in Telegraph Apparatus Telegraph |
POND, C. H. |
Telegraph |
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