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

Allan D. Dale

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Automatic service cutover for ISDN private exchange

Multiplex communications – Pathfinding or routing – Through a circuit switch
Patent

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Method and apparatus for polling telephony line status in an...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system
Reexamination Certificate

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Private exchange for ISDN

Multiplex communications – Wide area network – Packet switching
Patent

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Profile ID: LFUS-PAI-P-586853

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