4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Body contact wave transfer
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Denta-mandibular sound-transmitting system

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

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Device for picking up bone-conducted sound in external auditory

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

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Double-functioned hand-free device for cellular telephone

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

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Dual mode transducer for a portable receiver

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

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