4. Telephonic communications
  5. Substation or terminal circuitry
  6. Amplifying
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Signal detector with automatic gain control

Telephonic communications – Substation or terminal circuitry – Amplifying
Reexamination Certificate

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Signal level expansion apparatus as for a telecommunications sys

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Speech circuit configuration

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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