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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 = '313') AND (category.subclass = '231.01') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '313'; Subclass is '231.01';

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T / S Patent Date Description Patentee Category Assigned To
 1914
U 1,116,303 November 3, 1914 Arc Extinguisher
Use of explosive to break the arcing around a multipart insulator (see 1,127,043)		 LOCKE, Fred M.
 Transmission  
 1915
U 1,127,043 February 2, 1915 Electric Arc Extinguisher
Use of explosive to break the arcing around a multipart insulator (see 1,116,303)		 LOCKE, Fred M.
 Transmission  

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