scaffold2
DESCRIPTION
شرح لمخاطر السقالات المعدنيه واساليب التحكم فيهاTRANSCRIPT
(PPE)
SCAFFOLDING1Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company,for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94AL85000.2: (: ).3 :
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