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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 = '137') AND (category.subclass = '247.51') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '137'; Subclass is '247.51';

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T / S Patent Date Description Patentee Category Assigned To
 1874
U 154,638 September 1, 1874 Improvement in Casting Stench Traps
Method of casting lead S-traps
BROOKE, Homer
Misc  

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