4. Telephonic communications
  5. Substation or terminal circuitry
  6. Amplifying
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Hands-free phone converter

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Headset amplifier

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Headset amplifier with automatic log on/log off detection

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Headset amplifier with automatic log on/log off detection

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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