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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 = '15') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '57'; Subclass is '15';

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T / S Patent Date Description Patentee Category Assigned To
 1871
U 119,987 October 17, 1871 Improvement in Machines for Making Lightning Rods
Machine for making lightning rods (see 113,154) by wrapping wires around a central core, covering with a sheath of sheet copper, and coiling up the rod as it is produced		 KNAPP, George S.
 Lightning Rod Machine  

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