4. Telephonic communications
  5. Centralized switching system
  6. Call distribution to operator

Karl M. Henderson

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Method and system for automated customer services

Telephonic communications – Centralized switching system – Call distribution to operator
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Prepaid telephone calling card with message recording...

Telephonic communications – With usage measurement – Call charge metering or monitoring
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2120371

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