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

Thomas A. Stahl

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Apparatus and method for detecting telephone line status

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
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Battery feed circuit for a telephone system

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Profile ID: LFUS-PAI-P-1084870

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