|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 = '138') AND (category.subclass = '92') ORDER BY date ASC, patent, type|
Total of 1 patents found where: Class is '138'; Subclass is '92';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||154,638||September 1, 1874||Improvement in Casting Stench Traps
Method of casting lead S-traps
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