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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 = '501') AND (category.subclass = '135') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '501'; Subclass is '135';

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T / S Patent Date Description Patentee Category Assigned To
 1949
U 2,481,729 September 13, 1949 Porcelain Insulator Body
Porcelain clay body with an increased firing range		 DEWEY, Benjamin F.
 Porcelain Lapp Insulator Co., Inc.

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