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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 = '256') AND (category.subclass = '50') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '256'; Subclass is '50';

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T / S Patent Date Description Patentee Category Assigned To
 1905
U 799,433 September 12, 1905 Support Fastener for Lightning Conductors
Metal clips fitted in molded concrete or stone in order to secure lightning rod conductor to wall		 BAJOHR, Carl
 Lightning Rod Clip  

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