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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 = '23') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '23';

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T / S Patent Date Description Patentee Category Assigned To
 1882
U 269,018 December 12, 1882 Protecting Apparatus for Buildings
Lightning rod system with adjustable supports at ground level		 CROWELL, Ezra
DAWSON, Elisha C.
 Lightning Rod  

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