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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 = '471') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '425'; Subclass is '471';

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T / S Patent Date Description Patentee Category Assigned To
 1928
U 1,689,073 October 23, 1928 Indenting Tool
Tool used to roll across the surface of a clay insulatot to form indentions or a rough surface to produce a better griping surface for cement.		 HARVEY, William F.
 Tool  

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