Details of focus tube for focusing R. S. A. semaphore lamps, claimed to have given satisfactory service.


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    Title :

    A method of focusing signal lamps


    Additional title:

    Ry. Signal Engr


    Contributors:

    Published in:

    Publication date :

    1919


    Remarks:

    1 Fig.


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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