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

R. T. Watland

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Arrangement for intentionally blocking telephone calls to predef

Telephonic communications – Call or terminal access alarm or control – At switching center
Patent

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Arrangements for switching multiple packet types combined in a s

Multiplex communications – Wide area network – Packet switching
Patent

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Call announcement arrangement

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

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Call service initialization arrangement

Multiplex communications – Wide area network – Packet switching
Patent

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Communication path continuity verification arrangement

Multiplex communications – Wide area network – Packet switching
Patent

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Profile ID: LFUS-PAI-P-45712

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