4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Protective circuit
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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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High-voltage protection circuitry in a data access arrangement

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

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Hinge shield for network interface enclosure

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

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