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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 = '169.5') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '169.5';

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T / S Patent Date Description Patentee Category Assigned To
 1895
U 538,603 April 30, 1895 Lightning Rod
Hollow lightning rod with cup to divert water into the lower sections of the rod to improve conduction of current to ground		 SIMPSON, Harvey
 Lightning Rod  

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