4. Electrical audio signal processing systems and devices
  5. One-way audio signal program distribution
  6. Public address system

Active Audio

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Sound device provided with a geometric and electronic...

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Reexamination Certificate

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Sound device provided with a geometric and electronic...

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Reexamination Certificate

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