4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Power supply
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Remote power feed method and system

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Resistive feed rail generation in a power supply

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Returning ringing signals through the tip amplifier of...

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Ring relay control unit for foreign exchange station

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Ring voltage generation circuit and method for generating a...

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Ringing controller

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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