4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Testing of subscriber loop or terminal

Liam Keast

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External detection of optional telephone services

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

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External detection of optional telephone services on a...

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

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External detection of optional telephone services on an...

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

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Multi-user call waiting

Telephonic communications – Centralized switching system – Call distribution to operator
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2808785

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