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Dresser Industries, Inc.Dresser Industries, Inc.Niigata Engineering Co., Ltd.DKK-TOA Corp.KiOR, Inc.Gulf Canada Resources Ltd.Goodwin PlcEssef Corp.Essef Corp.Fracmaster Ltd.Tuboscope Vetco International, Inc.Tuboscope Vetco International, Inc.Nagarjuna Fertilizers & Chemicals Ltd.Hyundai Oilbank Corp.H.C. Price Co.Petro-Chem Development Co., Inc.Wuhan Petrochemical Engineering Design Co., Ltd.Oilflow Solutions, Inc.Biota Guard ASBiota Guard ASServ-Tech, Inc.Cokebusters Ltd.TORR Canada, Inc.Allis-Chalmers Energy, Inc.Techint SAEuropean Marine Contractors Ltd.Veritas DGC, Inc.Proserv ASCat Tech International Ltd.Construtora Andrade Gutierrez SA
PetroChina Co., Ltd.Idemitsu Kosan Co., Ltd.Exxon Mobil Corp.Mobil Corp.Standard Oil Co.W.R. Grace & Co.Osaka Gas Co., Ltd.Saudi Arabian Oil Co.Shell Oil Co.Standard Oil Co.China University of Petroleum (East China)China University of Petroleum (East China)Sanyo Chemical Industries Ltd.China National Offshore Oil Corp.China National Offshore Oil Corp.The Japan Steel Works Ltd.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 SE
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.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.Conoco, Inc.
