4. Telephonic communications
  5. Substation or terminal circuitry
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Febrile convulsion alarm

Telephonic communications – Substation or terminal circuitry
Reexamination Certificate

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Full duplex communication circuits with bilateral T hybrid...

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Full duplex speaker-phone providing increased loop stability

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Full duplex speakerphone

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

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Full duplex speakerphone

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Full-duplex digital speakerphone

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Fully-integrated telephone unit

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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