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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 = '439') AND (category.subclass = '877') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '439'; Subclass is '877';

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T / S Patent Date Description Patentee Category Assigned To
 1931
U 1,808,595 June 2, 1931 Lightning Rod Coupler
Lightning rod coupling with either male or female threads that is square and fits over and crimped to end of rods		 CRIPE, Earnest C.
 Lightning Rod Coupling  

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