Article describes simple device by means of which frogs could be controlled entirely from individual vehicles, merely by pressing switch.


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    Title :

    Driver-control for trolleybus frogs


    Additional title:

    Transport World


    Published in:

    Transport World ; 85 , n 2714


    Publication date :

    1939


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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