4. Electrical audio signal processing systems and devices
  5. Including amplitude or volume control
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Noise masking communications apparatus

Electrical audio signal processing systems and devices – Including amplitude or volume control
Reexamination Certificate

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Noise masking communications apparatus

Electrical audio signal processing systems and devices – Including amplitude or volume control
Reexamination Certificate

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Noise reduction device in an electroacoustic system

Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent

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Noise-protecting arrangement for ear protector

Electrical audio signal processing systems and devices – Including amplitude or volume control
Reexamination Certificate

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