4. Electrical audio signal processing systems and devices
  5. Sound or noise masking
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Remotely controlled sound mask

Electrical audio signal processing systems and devices – Sound or noise masking
Patent

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Sound masking and paging system

Electrical audio signal processing systems and devices – Sound or noise masking
Reexamination Certificate

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Sound masking system

Electrical audio signal processing systems and devices – Sound or noise masking
Reexamination Certificate

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Waveform playback device for active noise cancellation

Electrical audio signal processing systems and devices – Sound or noise masking
Reexamination Certificate

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