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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 = '428') AND (category.subclass = '681') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '428'; Subclass is '681';

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T / S Patent Date Description Patentee Category Assigned To
 1876
U 171,744 January 4, 1876 Improvement in Lightning Rods
Lightning rod composed of a copper sheet wrapped around a metal bar with copper wrapped wires on either side and the whole twisted		 SMITH, Charles H.
 Lightning Rod  

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