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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 = '210') AND (category.subclass = '231') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '210'; Subclass is '231';

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T / S Patent Date Description Patentee Category Assigned To
 1904
U 772,132 October 11, 1904 Filter Cloth
Design of filter cloth for filter press that reduces the water content of clay		 CROSSLEY, Joseph
 Filter Press  

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