ISO QMS 9001:2015 (Mazaya Al Aamal Contracting Co.)
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ISO EMS 14001:2015 (Mazaya Al Aamal Contracting Co.)
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ISO OHSAS 18001:2007 (Mazaya Al Aamal Contracting Co.)
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ISO QMS 9001:2015 (Al Kalthomi Environmental Works)
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ISO EMS 14001:2015 (Al Kalthomi Environmental Works)
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ISO OHSAS 18001:2007 (Al Kalthomi Environmental Works)
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