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PetroChina Co., Ltd.Idemitsu Kosan Co., Ltd.Mobil Corp.Exxon Mobil Corp.Standard Oil Co.Saudi Arabian Oil Co.W. R. Grace & Co.-Conn.China National Petroleum Corp.Osaka Gas Co., Ltd.Shell Oil Co.Standard Oil Co.China University of Petroleum (East China)Tokyo Gas Co., Ltd.China University of Petroleum (East China)Sanyo Chemical Industries Ltd.China National Offshore Oil Corp.China National Offshore Oil Corp.Exxonmobil Upstream Research Co.Angang Steel Co., Ltd.Beijing Yanshan Petrochemical Co., Ltd.Dresser Industries, Inc.Dresser Industries, Inc.Elf Aquitaine FertilisantsAlbemarle Corp.Ethyl Corp.Eni SpAConocoPhillipsTonen General Sekiyu KKSK Innovation Co., Ltd.Elf Aquitaine Fertilisants
PetroChina Co., Ltd.Idemitsu Kosan Co., Ltd.Mobil Corp.Exxon Mobil Corp.Standard Oil Co.Saudi Arabian Oil Co.China National Petroleum Corp.Osaka Gas Co., Ltd.Schlumberger Technologies, Inc.Standard Oil Co.Tokyo Gas Co., Ltd.Elf Atochem SAChina National Offshore Oil Corp.China National Offshore Oil Corp.JSWChina General Nuclear Power Corp.Voith GmbH & Co. KGaADuksan Co., Ltd.Beijing Yanshan Petrochemical Co., Ltd.Dresser Industries, Inc.Électricité de France SAElf Aquitaine FertilisantsHalliburton Co.Shell Deepwater Development, Inc.Messer SE & Co. KGaA (Germany)Eni SpAConoco, Inc.ConocoPhillipsSinopec Oilfield Service Corp.SK Innovation Co., Ltd.