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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 = '156') AND (category.subclass = '338') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '156'; Subclass is '338';

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T / S Patent Date Description Patentee Category Assigned To
 1930
U 1,742,625 January 7, 1930 Process of Uniting by Sealing the Insulating Parts of High Tension Insulators
Cement of rubber used to cement multipart insulator		 WECKERLE, Ferdinand
 Cement Studiengesellschaft Fuer Wirtschaft U. Industrie, M. B. H.

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