|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 = '174') AND (category.subclass = '138G') ORDER BY date ASC, patent, type|
Total of 1 patents found where: Class is '174'; Subclass is '138G';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|D||22,876||November 7, 1893||Design for an Insulator
Square flat insulator with large center hole and small hole in each corner
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