4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Electromagnetic

Yoshiya Usami

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Damper for a speaker apparatus

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Patent

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Optical pick up apparatus

Dynamic optical information storage or retrieval – Dynamic mechanism optical subsystem – Transducer carriage or actuator
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1593530

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