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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 = '200') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '425'; Subclass is '200';

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T / S Patent Date Description Patentee Category Assigned To
 1892
U 473,497 April 26, 1892 Pug Mill
Pug mill for extruding clay		 CROSSLEY, Joseph
 Pug Mill  

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