4. Telephonic communications
  5. Substation or terminal circuitry
  6. Sidetone control or hybrid circuit
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Circuit and method of reducing sidetone in a receive signal path

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

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Circuit for eliminating echo and side tones in a switching...

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate

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Combined sidetone and hybrid balance

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate

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