4. Telephonic communications
  5. Plural exchange network or interconnection
  6. With interexchange network routing

Thomas W. Lear

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Direct distance dialing (DDD) access to a communication...

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

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Direct distance dialing (DDD) access to a communications service

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Patent

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Profile ID: LFUS-PAI-P-1955327

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