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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 = '57') AND (category.subclass = '211') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '57'; Subclass is '211';

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T / S Patent Date Description Patentee Category Assigned To
 1875
U 159,961 February 16, 1875 Improvement in Lightning Rods
Improvement on patent 122,055 by using smaller wires in greater number to improve flexibility		 PHELPS, Myron D.
 Lightning Rod  

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