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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 = '86') AND (category.subclass = '20.12') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '86'; Subclass is '20.12';

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T / S Patent Date Description Patentee Category Assigned To
 1902
U 716,343 December 16, 1902 Machine for Forming the Interiors of Plastic Materials
Press for making porcelain insulators		 LOCKE, Fred M.
 Press  

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