4. Telephonic communications
  5. Repeater
  6. With gain or attenuation control

Theodore W. Wagner

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Apparatus for transmitting and/or receiving balanced signals on

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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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Apparatus for transmitting and/or receiving balanced signals on

Patent

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Digital telephone apparatus

Multiplex communications – Wide area network – Packet switching
Patent

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Modular telephone keyset structure

Patent

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Profile ID: LFUS-PAI-P-386596

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