4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Element or attachment

Kentaro Yonehara

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Electret capacitor microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate

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Electret capacitor microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate

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Electret capacitor microphone and method for producing the same

Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate

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Electroacoustic transducer

Equipment for production – distribution – or transformation of ene – Energy conversion or transformation
Design Patent

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Electroacoustic transducer

Equipment for production – distribution – or transformation of ene – Energy conversion or transformation
Design Patent

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Profile ID: LFUS-PAI-P-2376140

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