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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 = '246') AND (category.subclass = '46') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '246'; Subclass is '46';

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T / S Patent Date Description Patentee Category Assigned To
 1911
U 1,003,143 September 12, 1911 Electric Signaling Apparatus
Improved signaling of railways		 LOCKE, Louis P.
 Signal  

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