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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 = '285') AND (category.subclass = '420') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '285'; Subclass is '420';

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T / S Patent Date Description Patentee Category Assigned To
 1902
U 693,367 February 18, 1902 Pipe Joint
Pipe joint		 BROOKE, Homer
 Misc  

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