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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 = '281.4') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '29'; Subclass is '281.4';

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T / S Patent Date Description Patentee Category Assigned To
 1924
U 1,486,664 March 11, 1924 Assembling Machine for Insulator Knobs
Machine to assemble nail-knobs		 HIRES, John Edgar
 Knob Automatic Machinery and Equipment Co., Inc.

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