|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|
|U||1,003,143||September 12, 1911||Electric Signaling Apparatus
Improved signaling of railways
|LOCKE, Louis P.
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