4. Telephonic communications
  5. Special services
  6. Anonymous party

Charles Arnaud

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Method and system for transmitting a DTMF signal with...

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate

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Method for detecting voice presence on a communication line

Telephonic communications – Special services – Anonymous party
Patent

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Profile ID: LFUS-PAI-P-1415069

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