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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 = '138') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '57'; Subclass is '138';

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T / S Patent Date Description Patentee Category Assigned To
U 630,334 August 8, 1899 Machine for Making Lightning Rods
Machine for making lightning rods that are easily bent to aid in installation
DODD, West
Lightning Rod Machine  

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