Description of two-cell photoelectric, bidirectional, electronic timer; built-in electric counter tallies traffic automatically and traffic speeds are read and recorded manually; details of complete assembly.


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    Title :

    Electronic roadside speed timer developed by division of highways


    Additional title:

    Calif Highways Pub Works


    Contributors:
    Rieth, W.M. (author)


    Publication date :

    1942


    Remarks:

    Illustration p 7


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English