4. Telephonic communications
  5. Repeater
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Echo canceller

Telephonic communications – Repeater – Component processes bidirectional signals
Patent

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Electromagnetic relay used in a telephone exchange or the...

Telephonic communications – Repeater – Pulse or tone repeater
Reexamination Certificate

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Electronic feeding bridge for a space division switching network

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

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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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