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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 = '248') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '57'; Subclass is '248';

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T / S Patent Date Description Patentee Category Assigned To
 1876
R 7,063 April 18, 1876 Improvement in Lightning Conductors, Rods, or Cables
Lightning rod conductor made of wires twisted together and wrapped and twisted around a metal tube (see 120,457)		 PRESTON, Othniel
 Lightning Rod  

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