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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 = '83') AND (category.subclass = '57') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '83'; Subclass is '57';

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T / S Patent Date Description Patentee Category Assigned To
 1936
U 2,033,827 March 10, 1936 Insulator Forming Machine
Machine to form the underside and recesses between skirts and the petticoats by using a trimming device that can be adjusted to any angle and extend inward as needed		 HARVEY, Leo B.
FRENCH, Lucius L.
 Manufacturing Porcelain Insulator Corp.

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