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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 = '228') AND (category.subclass = '173.6') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '228'; Subclass is '173.6';

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T / S Patent Date Description Patentee Category Assigned To
 1929
U 1,709,805 April 16, 1929 Method of Making Insulator Supports
Secondary rack stamped out of one piece of sheet metal. (see patent 1,917,322)		 PEIRCE, JR., Charles L.
 Bracket/secondary Rack  

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