4. Electrical audio signal processing systems and devices
  5. Circuitry combined with specific type microphone or loudspeaker
  6. With piezoelectric microphone
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Acoustic sensor and electric stethoscope device...

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With piezoelectric microphone
Reexamination Certificate

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Audio A/D converter using frequency modulation

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With piezoelectric microphone
Reexamination Certificate

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