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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 = '292') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '292';

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T / S Patent Date Description Patentee Category Assigned To
 1936
U 2,048,504 July 21, 1936 Tower Supporting Insulator
Insulator to support radio antenna tower		 HAWLEY, Kent A.
 Radio Locke Insulator Corp.

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