4. Telephonic communications
  5. Repeater
  6. With gain or attenuation control
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AGC amplifier for two-wire line conditioner

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Apparatus for transmitting and/or receiving balanced signals on

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Communications systems

Telephonic communications – Repeater – With gain or attenuation control
Reexamination Certificate

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Enhanced line powered amplifier

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Enhanced line powered amplifier

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Intermediate amplifier for use in two-wire connections of a dial

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Signal level adjustment arrangement

Telephonic communications – Repeater – With gain or attenuation control
Reexamination Certificate

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Signal processing unit for network interface unit

Telephonic communications – Repeater – With gain or attenuation control
Reexamination Certificate

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Systems and methods for controlling telephone sound enhancement

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Voice enhancement system and method

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Voice enhancement system and method

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Voice enhancement system and method

Telephonic communications – Repeater – With gain or attenuation control
Patent

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