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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 = '264') AND (category.subclass = '131') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '264'; Subclass is '131';

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T / S Patent Date Description Patentee Category Assigned To
 1930
U 1,784,392 December 9, 1930 Manufacture of Insulators
Suspension insulator with glazed sanded surfaces to improve strength of cap		 ROWLAND, Davidge H.
 Suspension Locke Insulator Corp.

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