4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Protective circuit
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Resetting surge protection in telephone line interface circuits

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

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Retrofit interface apparatus and method for remote isolation dev

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Retrofit network interface apparatus

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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RF connected message recording device and method for a telephone

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Ring voltage termination by means of a spare fuse

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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