Toll crossbar system arranged to complete connections from trunks from outward toll positions to toll lines for outward calls; from toll lines to trunks to local offices for terminating calls; from one toll line to another for calls switched through Philadelphia.


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    Title :

    Philadelphia adopts automatic Toll switching


    Additional title:

    Bell Laboratories Rec


    Contributors:

    Published in:

    Publication date :

    1943


    Size :

    4 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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