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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 = '427') AND (category.subclass = '122') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '427'; Subclass is '122';

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T / S Patent Date Description Patentee Category Assigned To
 1934
U 1,975,576 October 2, 1934 Method of Applying a Conducting Coating on Insulators
RFI coating of carbon fused to the surface		 HAWLEY, Kent A.
 RFI Locke Insulator Corp.

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