4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Microphone capsule only
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IC processed piezoelectric microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Patent

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Inductor-based MEMS microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate

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Integrated base and electret condenser microphone using the...

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate

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