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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 = '670') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '428'; Subclass is '670';

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T / S Patent Date Description Patentee Category Assigned To
 1852
U 8,930 May 4, 1852 Improvement in Lightning Rods
Lightning rod point made of steel coated with various other metals such as copper, tin, etc.		 SPRATT, James
 Lightning Rod Point  

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