4. Electrical audio signal processing systems and devices
  5. Circuitry combined with specific type microphone or loudspeaker
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Harmonic amplifier and corresponding electro-acoustic...

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

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High noise suppression microphone

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

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Hybrid loudspeaker system for converting digital signals to acou

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

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