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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 = '7') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '256'; Subclass is '7';

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T / S Patent Date Description Patentee Category Assigned To
U 18,963 December 29, 1857 Improved Device for Attaching Lightning Rods
Lightning rod made of corrugated copper sheets and attached with iron spikes
Lightning Rod  
U 189,286 April 3, 1877 Improvement in Lightning Rods
Lightning rod of twisted sheet metal fitted with a serrated strip
Lightning Rod 1/2 to Henry Webbert
U 282,449 July 31, 1883 Lightning Rod
Lightning rod made of twisted copper or iron rods with points along the length exactly like barbed wire
DODGE, Thomas D.
Lightning Rod  

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