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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 = '6') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '256'; Subclass is '6';

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T / S Patent Date Description Patentee Category Assigned To
 1883
U 289,076 November 27, 1883 Lightning Conductor
Lightning rod made of twisted copper or iron rods with points along the length similar to barbed wire		 DODGE, Thomas D.
 Lightning Rod  

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