4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Protective circuit

Wayne Kwok-Wai Wong

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Detection of bridge taps by frequency domain...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate

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High current protection circuit for telephone interface

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2461713

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