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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 = '411') AND (category.subclass = '921') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '411'; Subclass is '921';

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T / S Patent Date Description Patentee Category Assigned To
 1894
U 522,428 July 3, 1894 Insulator
Wall tube secured with a clip		 MACE, Romaine
 Wall Tube The Interior Conduit & Insulation Co.

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