4. Telephonic communications
  5. Audio message storage, retrieval, or synthesis

Kalman Drebin

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Muting circuit for telephone answering machine

Telephonic communications – Audio message storage – retrieval – or synthesis
Patent

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Telephone privacy circuit

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – For detection of eavesdropping device
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Profile ID: LFUS-PAI-P-1638725

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