4. Multiplex communications
  5. Wide area network
  6. Packet switching

A. Ray Ivie

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Multiple access telephone extension systems and methods

Multiplex communications – Wide area network – Packet switching
Patent

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Secure access telephone extension system and method

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

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Secure access telephone extension system and method in a cordles

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent

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Profile ID: LFUS-PAI-P-1003665

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