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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 = 'D10') AND (category.subclass = '121') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is 'D10'; Subclass is '121';

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T / S Patent Date Description Patentee Category Assigned To
 1920
D 56,715 November 30, 1920 Design for a Ball for Lightning Rods and Barn Ventilators
Glass ball with spiralling and intersecting grooves on the surface
THOMPSON, George E.
Lightning Rod Ornament  

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