4. Telephonic communications
  5. Substation or terminal circuitry
  6. Power control or detection circuit
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Auto host disconnect on loss of power to a headset amplifier

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit
Reexamination Certificate

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Method and apparatus for digital PABX detection and modem...

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit
Reexamination Certificate

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Power efficient ADSL central office downstream class G power...

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit
Reexamination Certificate

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Power switch device utilizing phone loop signals to control...

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit
Reexamination Certificate

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Telephone apparatus for stabilizing call in no power...

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit
Reexamination Certificate

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Unbalanced slic with a built-in ring circuit

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit
Reexamination Certificate

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