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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)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.
PetroChina Co., Ltd.Idemitsu Kosan Co., Ltd.Exxon Mobil Corp.Saudi Arabian Oil Co.NOK Corp.The Lubrizol Corp.Husqvarna ABJX Nippon Oil & Energy Marine Service Corp.Sinopec Oilfield Service Corp.Elf Aquitaine FertilisantsElf Aquitaine FertilisantsEni SpATotalEnergies SEGraco, Inc.Petróleo Brasileiro SAAshland LLCEneos Corp.Afton Chemical Corp.Cognis Deutschland GmbH & Co. KGInfineum International Ltd.Graham Packaging Co. LPCastrol Ltd.BP Exploration Operating Co. Ltd.SEPPIC SAGulf Oil LPHarima Chemicals Group, Inc.Gulf Oil International UK Ltd.Indian Oil Corp. Ltd.Hitachi Powdered Metals Co., Ltd.Berry Plastics Holding Corp.
PetroChina Co., Ltd.Exxon Mobil Corp.Mobil Corp.Standard Oil Co.Osaka Gas Co., Ltd.Saudi Arabian Oil Co.Shell Oil Co.Standard Oil Co.BASF Corp.Tokyo Electric Power Co. Holdings, Inc.China National Offshore Oil Corp.China National Offshore Oil Corp.JSWToagosei Co., Ltd.Dresser Industries, Inc.Dresser Industries, Inc.Halliburton Co.ConocoPhillipsTonen General Sekiyu KKEni SpATotalEnergies SESmith International, Inc.Graco, Inc.Petróleo Brasileiro SACNOOC Energy Technology & Services Ltd.Shell Canada Ltd.Eneos Corp.Marathon Oil Co.Sanki Engineering Co., Ltd.Herberts GmbH