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

M. W. Shehata

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Analog display station apparatus and method of effecting telepho

Telephonic communications – Substation or terminal circuitry – Visual signalling
Patent

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Combination telephone network interface and cable television app

Telephonic communications – Subscriber line or transmission line interface
Patent

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Communication apparatus

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Communications apparatus

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Data transmitter-receiver having echo canceler with data delay

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

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Profile ID: LFUS-PAI-P-138564

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