4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Plural or compound reproducers

MM Gear Co., Ltd.

Corporate Assignee

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Corporate Assignee

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Headphone accessory

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Reexamination Certificate

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Headphones

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor
Design Patent

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Multi-channel headphones

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Reexamination Certificate

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