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

Donald D. Huizinga

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Apparatus for controlling the application of telephone line powe

Patent

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Dial pulsing circuit

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Digital conferencing method and arrangement

Multiplex communications – Wide area network – Packet switching
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Repertory telephone dialer with remote billing capability

Telephonic communications – With usage measurement – Call charge metering or monitoring
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Profile ID: LFUS-PAI-P-312311

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