4. Electrical audio signal processing systems and devices
  5. Monitoring of sound
  6. Amplification control responsive to ambient sound
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Remote automatic audio level control device

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

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Remote automatic volume control apparatus

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

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