4. Telephonic communications
  5. Substation or terminal circuitry
  6. Sidetone control or hybrid circuit
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Differential receive booster amplifier for telephone instruments

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Duplex microphone communication system

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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