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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent WHERE (category = 'Trolley Hanger') ORDER BY date ASC, 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
 1897
U 576,392 February 2, 1897 Insulator
Trolley hanger		 BILLINGS, Harry E.
 Trolley Hanger The Billings & Spencer Co.
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.
 Trolley Hanger  

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