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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 = '216') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '57'; Subclass is '216';

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T / S Patent Date Description Patentee Category Assigned To
 1877
U 190,391 May 1, 1877 Improvement in Lightning Rods
Lightning rod made of a central galvanized iron rod twisted around with several galvanized rods all soldered together then intertwined with strips of copper that are soldered to the core
VAN LOON, Nicholas
Lightning Rod  

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