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The performance of earmuffs in the actual working environment was studied with two dosimeters which had been modified so that the 1/4 in. microphone connecting to the dosimeter could be placed inside an earmuff with negligible noise leakage. It was found that personal hearing protection, at least with earmuffs, is a potentially adequate method of protection against noise-induced hearing loss in most industrial working situations. Most of the problems involving the use of hearing protectors in a hearing conservation program can be overcome by education and proper fitting.

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