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耳栓多重+イヤーマフで最強の遮音性(防音)に挑戦 - Multiple earplugs and earmuffs for sound deprivation

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Published on Jul 20, 2013

http://kunisan.jp/mimisen/
フォームタイプの耳栓、シリコンタイプの耳栓を多重に装着の上、イヤーマフを装着すると、外の音がほとんど聞こえなくなります。
Multiple earplugs and earmuffs are used for sound deprivation.

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