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  5. Headphone circuits
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Method and apparatus for conserving battery power

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Method and apparatus to transmit audio into the human ear

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Methods of calibrating tone-based communications systems

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Multipurpose earphone set

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Music reproduction apparatus, audio player, and headphone

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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