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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 = '209') AND (category.subclass = '306') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '209'; Subclass is '306';

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T / S Patent Date Description Patentee Category Assigned To
 1904
U 771,557 October 4, 1904 Apparatus for Screening Liquid Clay
miscellaneous apparatus for screening liquid clay		 LOCKE, Fred M.
 Miscellaneous  

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