4. Electrical audio signal processing systems and devices
  5. Circuitry combined with specific type microphone or loudspeaker
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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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Miniature acoustical transducer with filter/regulator power supp

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

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Multi-channel pulse width modulation apparatus

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

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Multifunction acoustic device

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

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Multiple function, bi-directional input/output interface for...

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

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Mute circuit for a microphone

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

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