Brief notes indicate how various types of manual local boards were modified during war to enable them to be used as outward toll positions to relieve shortage of toll equipment; circuit diagram indicates old and new arrangement.


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    Title :

    Toll switchboard no. 6


    Additional title:

    Bell Laboratories Rec


    Contributors:

    Published in:

    Publication date :

    1947


    Size :

    3 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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