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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 = '420') AND (category.subclass = '562') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '420'; Subclass is '562';

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T / S Patent Date Description Patentee Category Assigned To
 1850
U 7,008 January 8, 1850 Improvement in Alloys for Points of Lightning Rods
Alloy composed of tin, antimony, bismuth, silver, platinum, and silex		 SPRATT, James
 Lightning Rod Point  

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