20 Party Per Line, Dial Rjural Code Ringing on a Single Wire in the Bell System – Bruce Crawford 558

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  • Create Date July 1, 1994
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20 Party Per Line, Dial Rjural Code Ringing on a Single Wire in the Bell System - Bruce Crawford 558

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20 Party Per Line Dial Rjural Code Ringing on a Single Wire in the Bell System - Bruce Crawford 558Download