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Halliburton Energy Services, Inc.PetroChina Co., Ltd.Exxon Mobil Corp.Mobil Corp.Standard Oil Co.Osaka Gas Co., Ltd.Shell Oil Co.Standard Oil Co.Tokyo Gas Co., Ltd.BASF Corp.Tokyo Electric Power Co. Holdings, Inc.China National Offshore Oil Corp.China National Offshore Oil Corp.JSWChevron U.S.A., Inc.Toagosei Co., Ltd.Dresser Industries, Inc.Dresser Industries, Inc.ConocoPhillipsTonen General Sekiyu KKEni SpATotalEnergies SESmith International, Inc.Graco, Inc.Tatsuno Corp.CNOOC Energy Technology & Services Ltd.Eneos Corp.TOHO GAS Co., Ltd.Marathon Oil Co.Sanki Engineering 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.
Imperial Oil Ltd.Anadarko Petroleum Corp.Apache Corp.Abu Dhabi National Oil Co.China Oil HBP Science & Technology Co., Ltd.China Oil HBP Science & Technology Co., Ltd.CNOOC Petroleum North America ULCEngepet - Empresa de Engenharia de Petróleo Ltda.
Imperial Oil Ltd.Anadarko Petroleum Corp.Apache Corp.CNOOC Petroleum North America ULCEOG Resources, Inc.
Imperial Oil Ltd.Anadarko Petroleum Corp.Apache Corp.Abu Dhabi National Oil Co.PetroChina Northwest United Pipelines Co., Ltd.CNOOC Petroleum North America ULCDTE Gas Co.National Gas Transmission PLCEOG Resources, Inc.Technip USA, Inc.MOF Technologies Ltd.Angstore Technologies Ltd.
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)Tokyo Gas Co., Ltd.China University of Petroleum (East China)Sanyo Chemical Industries Ltd.China National Offshore Oil Corp.China National Offshore Oil Corp.Chevron U.S.A., Inc.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.