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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 = '248') AND (category.subclass = '231.31') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '248'; Subclass is '231.31';

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T / S Patent Date Description Patentee Category Assigned To
 1909
U 937,984 October 26, 1909 Insulator Bracket
Bracket to mount insulator in mortar between bricks		 BROWN, Edward V.
 Bracket 1/2 to Adolph Day

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