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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 = '248') AND (category.subclass = '515') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '248'; Subclass is '515';

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T / S Patent Date Description Patentee Category Assigned To
 1884
U 293,612 February 12, 1884 Lightning Diffuser
Lightning rod with special bracket to hold the rod away from the building		 WOOLLEY, Leonidas G.
 Lightning Rod  

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