4. Telephonic communications
  5. Repeater
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Dialing pulse signature recognizing method and device

Telephonic communications – Repeater – With signal conversion
Patent

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Digital circuit for conditional initialization

Telephonic communications – Repeater – Pulse or tone repeater
Patent

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Digital loop carrier system with enhanced call handling and...

Telephonic communications – Repeater
Reexamination Certificate

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Digital voice transmission having improved echo suppression

Telephonic communications – Repeater – With signal conversion
Patent

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