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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.China General Nuclear Power Corp.JSWExxonmobil Upstream Research Co.China 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.ConocoPhillips
China Coal No. 3 Construction (Group) Corp. Ltd.Santa Fe International Corp.Petro-CanadaHawker Resources, Inc.Hawker Resources, Inc.Bj Energy Solutions LLCNatural Gas Solutions North America LLCDailey Petroleum Services Corp.Boart Longyear, Inc.Canadian Energy Services LPCanadian Energy Services LPChina Coal Huajin Group Co., Ltd.Caledus Ltd.CORONET-Metallwarenfabrik GmbHChongqing Nantong Mining Co. Ltd.Ocean Drilling & Exploration Co.Ocean Drilling & Exploration Co.Gr Energy Services Management, LPInner Mongolia Mengtai Group Co., Ltd.Shandong Guangming Tungsten & Molybdenum Co. Ltd.Shandong Guangming Tungsten & Molybdenum Co. Ltd.Noble Drilling Corp.Noble Drilling Corp.Shandong Offshore Equipment Co. Ltd.Shandong Offshore Equipment Co. Ltd.Anglo American Industrial Corp. Ltd.Valkyrie Commissioning Services, Inc.Shaanxi Coalbed Methane Development Co., Ltd.Alpine, Inc.Gushor, Inc.