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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 = '49') AND (category.subclass = '53') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '49'; Subclass is '53';

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T / S Patent Date Description Patentee Category Assigned To
 1956
U 2,738,838 March 20, 1956 Glass Block Ventiliating Device
Operable glass block vent		 SUTTER, John H.
 OI Owens-Illinois Glass Co.

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