发明名称 Low sound attenuating hearing protection device
摘要 A hearing protection device and a method of manufacturing thereof is provided. The device includes a sound attenuating portion for being disposed within an ear canal of a user to obstruct the passage of sound and a channel formed through the sound attenuating portion for allowing sound to pass through the sound attenuating portion.
申请公布号 US7697706(B2) 申请公布日期 2010.04.13
申请号 US20030700213 申请日期 2003.11.03
申请人 3M INNOVATIVE PROPERTIES COMPANY 发明人 DOTY MARC
分类号 H04R25/00;A61F11/00;A61F11/08;A61F11/12 主分类号 H04R25/00
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