El-Aidy , Mahmoud Youness . <br/><br/>
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. 
<br/><br/> includes summary  in arabic. 
<br/><br/>Thesis (M.S ) -- Cairo University, 1993. 
<br/><br/>includes bibliogrphic  referance (77-86). 
<br/><br/> All age. 
<br/><br/><label>Dewey Class. No.: </label>530.81 
<br/><br/><label>National Library of Medicine Call No.: </label> / ES