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pp.719-722
Published Date 1958/9/20
DOI https://doi.org/10.11477/mf.1492202079

Hearing tests are conducted among indivi-duals who have been constantly exposed to noise ranging from 70-90 phon in their res-pective place of occupation for the period of 1 year group A. for 15 years groop B and for 30 years group C. The group B lead with the number showing C5 dip and it was follo-wed by group C: the least number was sho-wn in group A. A significant difference is noted in decibel hearing loss at 4000 c/s among the three group when the results are compared to each other.


Copyright © 1958, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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