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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 = '172') AND (category.subclass = '89') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '172'; Subclass is '89';

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T / S Patent Date Description Patentee Category Assigned To
U 894,201 July 28, 1908 Insulator
Pin with a threaded wooden block making up one-half of the thimble and metal projection on the other side contacting the threads to keep the wooden half pressed against the pinhole
HALLETT, Thomas E.

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