The present invention relates to an earplug with a through duct, in which a membrane element is adapted and comprises a membrane holder and a membrane held thereby which is adapted to lock the membrane element. The invention also relates to a method of making such an earplug and a method of affecting the course of the attenuation curve of an earplug.
申请公布号
WO0176520(A1)
申请公布日期
2001.10.18
申请号
WO2001SE00734
申请日期
2001.04.04
申请人
DALLOZ SAFETY AB;HAAKANSSON, JOERGEN;HISELIUS, PER;PERSSON, MARIE