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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 = '52') AND (category.subclass = '601') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '52'; Subclass is '601';

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T / S Patent Date Description Patentee Category Assigned To
 1939
U 2,156,623 May 2, 1939 Glass Building Block
Block with dovetail masonry anchor receiver strips in glass		 EASTUS, Harold L.
 OI Owens-Illinois Glass Co.

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