4. Telephonic communications
  5. Substation or terminal circuitry
  6. For loudspeaking terminal
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Automatic gain control in a loudspeaker telephone set

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

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Automatic volume adjustment of voice transmitted over a...

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

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