Illustrated description of a signal worked by a motor placed in a box at the top of the post. (700 w.)


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    Title :

    Sargent's automatic semaphore


    Additional title:

    R R Gaz


    Published in:

    Publication date :

    1899


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English


    Keywords :


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