4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Body contact wave transfer
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Transmitter-receiver having ear-piece type acoustic transducing

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

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Two active element in-the-ear microphone system

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

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