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Piezoelectric driven flow modulator

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent

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Plug, sound inputting and outputting apparatus, and noise...

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation
Reexamination Certificate

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Process and arrangement of monitoring the effectiveness of a...

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation
Reexamination Certificate

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Process and device for focusing acoustic waves

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Counterwave generation control path
Reexamination Certificate

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Processes and devices for protecting a given volume, preferably

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent

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