4. Telephonic communications
  5. With usage measurement
  6. Call charge metering or monitoring

Jost Kawczyk

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Code converter comprising protection circuit

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Communication system for detecting an unauthorized intruder term

Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent

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Network station

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1396595

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