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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 = '68') AND (category.subclass = '181R') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '68'; Subclass is '181R';

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T / S Patent Date Description Patentee Category Assigned To
 1888
U 383,734 May 29, 1888 Insulator for Electrical Wires
Self-tying slot top & metal keeper
KEYES, Frank E.
Self-tying Slot Top  

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