The patent relates to a highway-railroad crossing signalling system using microwave telemetry to convey control information from a remote sensing location to a receiver coupled to an active motorist warning device.


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    Title :

    Railroad Crossing Signalling System


    Contributors:

    Publication date :

    1971


    Size :

    8 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    A Railroad Crossing Signalling System

    J. B. Hopkins | NTIS | 1971


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