4. Electrical audio signal processing systems and devices
  5. Monitoring of sound
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Headset visual feedback system

Electrical audio signal processing systems and devices – Monitoring of sound
Reexamination Certificate

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Headset with ambient sound

Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Reexamination Certificate

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Hearing aid method and apparatus

Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Patent

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