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Union Carbide Corp.PetroChina Co., Ltd.Standard Oil Co.BP Chemicals Ltd.Standard Oil Co.Kolon Industries, Inc.Snamprogetti SpAIdemitsu Petrochemical Co., Ltd.ConocoPhillipsPetróleo Brasileiro SAPGS Geophysical ASLarsen & Toubro Ltd.Great Lakes Chemical Corp.Great Lakes Chemical Corp.Indian Oil Corp. Ltd.Phillips 66Repsol SAToyo Gosei Co., Ltd.Kyowa Hakko Chemical Co., Ltd.Cray Valley SASK Geocentric Co.Mitsubishi Oil Co. Ltd.Montecatini SpAHindustan Petroleum Corp. Ltd.Membrane Technology & Research, Inc.Wintershall Holding GmbHKiOR, Inc.Lyten, Inc.Instytut Nafty i GazuMcDermott International, Inc.
PetroChina Co., Ltd.Idemitsu Kosan Co., Ltd.Exxon Mobil Corp.Mobil Corp.Standard Oil Co.W.R. Grace & Co.Osaka Gas Co., Ltd.Shell Oil Co.Standard Oil Co.China University of Petroleum (East China)China University of Petroleum (East China)Kolon Industries, Inc.Sanyo Chemical Industries Ltd.China National Offshore Oil Corp.China National Offshore Oil Corp.Angang Steel Co., Ltd.Dresser Industries, Inc.Dresser Industries, Inc.Beijing Yanshan Petrochemical Co., Ltd.Albemarle Corp.ConocoPhillipsStorz GmbH & Co. KGTonen General Sekiyu KKElf Aquitaine FertilisantsElf Aquitaine FertilisantsEni SpASK Innovation Co., Ltd.TotalEnergies SEGraco, Inc.Shanxi Taigang Stainless Steel Co., Ltd.
BASF SEPetroChina Co., Ltd.Idemitsu Kosan Co., Ltd.Exxon Mobil Corp.Mobil Corp.Standard Oil Co.Osaka Gas Co., Ltd.Saudi Arabian Oil Co.Schlumberger Technologies, Inc.Standard Oil Co.Tokyo Gas Co., Ltd.China National Offshore Oil Corp.China National Offshore Oil Corp.Schlumberger Canada Ltd.JSWChina General Nuclear Power Corp.China General Nuclear Power Corp.Chevron U.S.A., Inc.Voith GmbH & Co. KGaADuksan Co., Ltd.Dresser Industries, Inc.Dresser Industries, Inc.Beijing Yanshan Petrochemical Co., Ltd.Électricité de France SAElf Atochem SAHalliburton Co.Messer SE & Co. KGaA (Germany)Conoco, Inc.ConocoPhillipsSinopec Oilfield Service Corp.