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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 = '393') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '52'; Subclass is '393';

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T / S Patent Date Description Patentee Category Assigned To
 1940
U 2,198,450 April 23, 1940 Light Transmitting Structure
Skylight construction using glass blocks		 CHERTKOF, Jack O.
 OU  
 1967
U 3,347,003 October 17, 1967 Protective Mounting Structure for Retractable Antenna
Retractable antenna for a bomb shelter		 LAPP, Rudolph S.
 Antenna Lapp Insulator Co., Inc.

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