4. Electrical audio signal processing systems and devices
  5. Sound or noise masking
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Masking sound device

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

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Method and apparatus for communication operator privacy

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

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Multichannel masking sound generator

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

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