4. Electrical audio signal processing systems and devices
  5. Megaphones

Paul Disler

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Electronic driving circuit for directing an audio signal...

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
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Hearing aid device, and operating and adjustment methods...

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Testing of hearing aids
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Voice amplifier for mask

Electrical audio signal processing systems and devices – Megaphones
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Voice amplifier for mask

Electrical audio signal processing systems and devices – Megaphones
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2385833

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