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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 = '244') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '57'; Subclass is '244';

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T / S Patent Date Description Patentee Category Assigned To
 1871
U 112,426 March 7, 1871 Improvement in Lightning Rods
Lightning rod made of three or more galvanized iron wires with copper wire laid over and in the grooves between the iron wires to form a metal rope		 CUSHMAN, Sylvanus D.
 Lightning Rod  

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