4. Telephonic communications
  5. Substation or terminal circuitry
  6. For loudspeaking terminal
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Vandal-resistant communications station

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Versatile circuit for interfacing with audio headsets

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Voice control circuit for a communication terminal

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Voice mail apparatus and control method thereof

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Voice signal clipping circuit and telephone set therewith

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Voice switched gain system

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Voice switched speakerphone with filters having exponential tran

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Voice-switched telephone circuit with center idle state

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Voice-switching device and method for multiple receivers

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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