Article describes simple device by means of which frogs could be controlled entirely from individual vehicles, merely by pressing switch.
Driver-control for trolleybus frogs
Transport World
Transport World ; 85 , n 2714
1939
Article (Journal)
English
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Driver control of trolleybus overhead
Engineering Index Backfile | 1942
|Engineering Index Backfile | 1939
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Engineering Index Backfile | 1947