jibi to rinsho
Online ISSN : 2185-1034
Print ISSN : 0447-7227
ISSN-L : 0447-7227
A New Ear-Plug
Hidetaka TAKEDA
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JOURNAL FREE ACCESS

1978 Volume 24 Issue 1 Pages 54-62

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Abstract

A new ear-plug is designed. This plug shows an excellent results in preventing sound of high frequencies, and does not give direct influence of atmospheric pressure changes to the ear. The plug is made of silicone, is light weighted, and has spiral pore in it. This plug is very easy to wear.

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