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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 = '411') AND (category.subclass = '939') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '411'; Subclass is '939';

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T / S Patent Date Description Patentee Category Assigned To
 1928
U 1,691,964 November 20, 1928 Insulator Locking Device
Pin with locking device to fit in threads to secure insulator		 DICKEY, Ray S.
CARNAHAN, Paul A.
 Pin  

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