4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Protective circuit
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Over-voltage protection circuit for use with a telephone...

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

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Overload protection circuit for a telephone subscriber line feed

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

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Overvoltage protection circuits

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

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Overvoltage protection scheme for subscriber loops and method of

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

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