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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 = '221') AND (category.subclass = '224') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '221'; Subclass is '224';

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T / S Patent Date Description Patentee Category Assigned To
 1920
U 1,342,053 June 1, 1920 Bushing Forming Machine
Machine to manufacture wall tubes and bushings		 MCKNIGHT, Oscar W.
 Wall Tube Brunt Tile & Porcelain Co.

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