4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Protective circuit

Patrick Goodrich

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Automatic electronic audio signal attenuating device and method

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone loop-current regulator

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Profile ID: LFUS-PAI-P-404283

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