4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Body contact wave transfer
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Wearable communication device

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Body contact wave transfer
Reexamination Certificate

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Wireless hands-free apparatus with sound-absorbing function

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Body contact wave transfer
Reexamination Certificate

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