4. Telephonic communications
  5. Substation or terminal circuitry
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Gain control

Telephonic communications – Substation or terminal circuitry – Amplifying
Reexamination Certificate

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Generic line impedance matching circuit using decomposed...

Telephonic communications – Substation or terminal circuitry – Impedance matching or line equalizing
Reexamination Certificate

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Ground key detection circuit and method for...

Telephonic communications – Substation or terminal circuitry
Reexamination Certificate

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