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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 = '284') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '29'; Subclass is '284';

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T / S Patent Date Description Patentee Category Assigned To
U 1,314,682 September 2, 1919 Spur Forming Machine
Machine for making nail-knobs (see 1,517,084)
Knob Brunt Tile & Porcelain Co.

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