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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 = '720.1') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '720.1';

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T / S Patent Date Description Patentee Category Assigned To
 1874
U 152,153 June 16, 1874 Improvement in Lightning Rods
Lightning rod made of sheet metal rolled to form four tubular sections with two of the tubes fitted with dowell pins to connect the rod sections		 MOTT, John M.
 Lightning Rod  

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