4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
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Noise removing apparatus using a microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Thermal response to – or generation of – sound vibration
Patent

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Non-linearly tapering transmission line speakers

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure
Reexamination Certificate

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Noticeboards incorporating loudspeakers

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Driven diverse static structure
Reexamination Certificate

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