4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With special service

Peter M. Reum

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Answer supervision over pulse code modulated carrier system and

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Patent

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Sealing current generator for a telephone circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Smart data station termination (DST) without active equalizers

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent

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System for implementing broadband audio program telephony circui

Multiplex communications – Wide area network – Packet switching
Patent

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System for testing 2B1Q telephony loopback circuits and method t

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent

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Profile ID: LFUS-PAI-P-160864

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