4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Protective circuit
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Electronic contacts and associated devices

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

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Electronic inductor with transmit signal telephone line driver

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

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Enhanced high voltage line interface circuit

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

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External filter box

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

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