4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Protective circuit
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Integrated ring detection circuit and power cross detection circ

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

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Interface circuit between a subscriber's telephone line and exch

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

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Interface circuit with transient event tolerance

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

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Isolating circuit for telephone apparatus

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

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