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US07730994B2 Acoustic panel and manufacturing method 失效
声学面板及制造方法

Acoustic panel and manufacturing method
Abstract:
An acoustic panel (1) has a recess (8) extending part or all way down to a facing (7). A panel loudspeaker (11) may be fixed in the recess or a water sprinkler (14) or other device may be mounted in or above the recess.
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