Grouped into three general classes as follows; color light, position light, and position color light.


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    Title :

    Light signals


    Additional title:

    Am. Ry. Assn. Signal Section -- Proc



    Publication date :

    1928


    Size :

    25 pages


    Remarks:

    26 Figs.


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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