|SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN name ON name.patent = patent.patent AND name.type = patent.type WHERE (category = 'Trolley Hanger') ORDER BY last_name ASC, first_name, date, patent, type|
Total of 2 patents found where: Category is 'Trolley Hanger';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|BILLINGS, Harry E.|
|U||576,392||February 2, 1897||Insulator
|BILLINGS, Harry E.
||Trolley Hanger||The Billings & Spencer Co.|
|KEITHLY, Willie C.|
|U||579,725||March 30, 1897||Insulator and Holder for Electric Railways
Trolley hanger insulator suspended from a cable. It is composed of an inverted insulator cup and a metal cover.
|KEITHLY, Willie C.
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