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Mechanical acoustic filter by erosion etching

Acoustics – Diaphragm – With resonant chamber
Reexamination Certificate

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Method and apparatus for augmentation of sound by enhanced reson

Acoustics – Diaphragm – With resonant chamber
Patent

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Method and apparatus of expanding acoustic reproduction range

Acoustics – Diaphragm – With resonant chamber
Patent

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Microphone and acoustic equalizer therefor

Acoustics – Diaphragm – With resonant chamber
Patent

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