4. Telephonic communications
  5. Telephone line or system combined with diverse electrical...
  6. Having transmission of a digital message signal over a...

William E. Levene

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Apparatus and method for automatically switching a headset betwe

Telephonic communications – Centralized switching system – Switching apparatus for connecting calling line to...
Patent

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Data diagnostics with leds on the face of a telephone

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

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Escape sequence using monitoring of control signal states

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

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Profile ID: LFUS-PAI-P-280110

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