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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 = '228') AND (category.subclass = '211') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '228'; Subclass is '211';

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T / S Patent Date Description Patentee Category Assigned To
 1932
U 1,852,093 April 5, 1932 Article of Manufacture and Process of Making It
RFI metallic coating and process of applying it to porcelain insulators		 SMEDE, Lloyd
SHAND, Errol B.
 RFI Westinghouse Electric & Mfg. Co.

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