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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 = '52') AND (category.subclass = '711') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '711';

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T / S Patent Date Description Patentee Category Assigned To
 1942
U 2,292,948 August 11, 1942 Insulator and the Like
Wireholder with slot for attaching lag screw		 KENDALL, Earl H.
 Wireholder  

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