4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Network interface device

Paul R. Bufkin

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Method and apparatus for providing a ground reference for teleph

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Verification of subscriber lines prior to cutover to a new switc

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system
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Profile ID: LFUS-PAI-P-1603770

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