4. Telephonic communications
  5. Substation or terminal circuitry
  6. Conversion of signal form
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Cascade low-pass filter to improve xDSL band attenuation for...

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Reexamination Certificate

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Communication device comprising an off-hook detection circuit

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Reexamination Certificate

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Communication terminal apparatus

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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Computer telephony headset amplifier

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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Connection apparatus for connecting a digital or analog...

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Reexamination Certificate

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Connection apparatus for connecting a digital or analog...

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Reexamination Certificate

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