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TT Automotive Steel (Thailand) Co.,Ltd.
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มาตรฐาน ISO 9001 : 2015 , ISO 14001 : 2015
มาตรฐาน OHSAS 18001 : 2007 , ISO 45001 :2018
มาตรฐาน IATF 16949 : 2016 For the ( Manufacture of slit metal coils and Additional facilities support function )