|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|
|U||771,557||October 4, 1904||Apparatus for Screening Liquid Clay
miscellaneous apparatus for screening liquid clay
|LOCKE, Fred M.
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