4. Telephonic communications
  5. Substation or terminal circuitry
  6. Sidetone control or hybrid circuit

David A. Pepper

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Automatic sidetone selector

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Telephone subscriber line voltage change detection

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Profile ID: LFUS-PAI-P-934690

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