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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 = '72') AND (category.subclass = '52') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '72'; Subclass is '52';

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T / S Patent Date Description Patentee Category Assigned To
 1884
U 297,291 April 22, 1884 Portable Lightning Rod Machine
Portable machine to make lightning rods		 PATEE, Theodorus H.
 Lightning Rod Machine  

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