4. Telephonic communications
  5. Repeater
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Channel interface unit

Telephonic communications – Repeater – With signal conversion
Patent

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Channel interface unit

Telephonic communications – Repeater – With signal conversion
Patent

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Circuit and method for active termination of a transmission...

Telephonic communications – Repeater – Component processes bidirectional signals
Reexamination Certificate

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Circuitry for telephone systems

Telephonic communications – Repeater
Patent

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Communication system tonal component maintenance techniques

Telephonic communications – Repeater – Pulse or tone repeater
Reexamination Certificate

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Communications systems

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

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Control of signal transmission

Telephonic communications – Repeater – With frequency discriminator or negative impedance element
Patent

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