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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 = '439') AND (category.subclass = '13') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '439'; Subclass is '13';

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T / S Patent Date Description Patentee Category Assigned To
 1888
U 377,742 February 14, 1888 Lightning Rod Attachment for Windmills
Lightning rod attached to windmills by means of a standard fixed rod and one that travels around with the windmill to keep the point in continuous contact with the rod conductor to ground		 DANIELS, Eugene O.
 Windmill  

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