4. Electrical audio signal processing systems and devices
  5. Circuitry combined with specific type microphone or loudspeaker
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Vibrostimulative device

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Patent

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Voltage biased capacitor circuit for a loudspeaker

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

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Voltage supply circuit and microphone unit

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

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Voltage supply circuit and microphone unit comprising the same

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

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Voltage supply circuit, power supply circuit, microphone...

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

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