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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 = '425') AND (category.subclass = 'DIG12') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '425'; Subclass is 'DIG12';

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T / S Patent Date Description Patentee Category Assigned To
 1928
U 1,679,345 August 7, 1928 Method and Apparatus for Casting Ceramic Pieces
Manufacturing method of casting bushings with a hollow core		 AUSTIN, Arthur O.
 Manufacturing The Ohio Brass Co.

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