El-Aidy , Mahmoud Youness .

Subjective and objective measurements of sound attenuation by ear protectors of circumaural type . [Thesis /] قياسات موضوعية وشخصية عن خفض الضوضاء بواسطة واقية السمع حول الاذنية . Mahmoud Youness El-Aidy . - 1993. - 86 p : ill ; 29 cm.

includes summary in arabic.

Thesis (M.S ) -- Cairo University, 1993.

includes bibliogrphic referance (77-86).

All age.

530.81

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