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Acoustic feedback cancellation for equalized amplifying systems

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

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Adaptive conferencing pod sidetone compensator connecting to...

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

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Adaptive hybrid circuit

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

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Adaptive line hybrids

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

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Apparatus and method for detecting far end speech

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

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Apparatus for reducing echoes and noises in telephone

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

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Architecture for telephone set

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

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Attended messaging machine

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

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Automatic sidetone selector

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

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