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EXXON (US), Royal Dutch Shell (UK, Pays Bas), Mobil (US) BP (UK) ELF Aquitaine (F),
TEXACO (US), ENI (Italie), CHEVRON ( US), AMOCO (US),TOTAL (France),PDVSA (Venezuela),
SSangyong (Corée), Nippon Oil (Japon),SunkYong (Corée), PEMEX (Mexico), USX (US),
Atlantic Richfield, Petrobras, Japan Energy (J), REPSA (Espagne), IDEMITSU KOSAN (J),
STATOIL (Norvege), Philips Petroleum (US), INDIAN OIL (In.) , Petrofina (Bel.), Cosmo Oil
(J), Showa shell (J), Ashland (US), Coastal( US), NESTE (Finland), Chinese petroleum
(Taiwan)
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