|SELECT DISTINCT patent.*, YEAR(date) as year FROM patent WHERE (category = 'Signal') ORDER BY category ASC, date, patent, type|
Total of 1 patents found where: Category is 'Signal';
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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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