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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 = '49') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '156'; Subclass is '49';

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T / S Patent Date Description Patentee Category Assigned To
 1942
U 2,301,266 November 10, 1942 Method and Means for Transposing Electrical Conductors
Tensioning device before and after transposition brackets for carrier circuits		 FOX, Arthur L.
 Transposition Bell Telephone Laboratories, Inc.

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