Ear protection device
作者： Dean Bavetta , Gary F. Prokop , Steve Remy , Brian E. Le Gette , Paul Kay
DOI:
关键词: Physics 、 Optics 、 Geometry
摘要: An apparatus comprising a first curved band portion and second portion. The has end, an inner side outer side. defines passageway between the end of opening. A motion-restraint is proximate to insertable into opening range motion within
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