Until recently, toll tandem switching in No 3 type toll offices has been performed at Toll Tandem Switchboard No 3; 3B toll switchboard described.


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    Title :

    3B toll switchboard


    Additional title:

    Bell Laboratories Rec


    Contributors:

    Published in:

    Publication date :

    1939


    Size :

    4 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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