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PetroChina 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.Conoco, Inc.
JFE Steel Corp.Marathon Oil Co.CNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.Ceca SAVallourec SACARBO Ceramics, Inc.Elliott Co.Membrane Technology & Research, Inc.Grant Prideco, Inc.Wuxi Seamless Oil Pipe Co. Ltd.Scientific Drilling International, Inc.Trican Well Service Ltd.Hammelmann GmbHAnadarko Petroleum Corp.Intelliserv, Inc.Shanghai Hilong Drill Pipe Co. Ltd.Gyrodata, Inc.Yantai Jereh Oilfield Services Group Co. Ltd.Yantai Jereh Oilfield Services Group Co. Ltd.Netzsch Gertebau GmbHNexen Corp.Chimec SpALeistritz AGDI Corp.Tianhe Oil Group Huifeng Petroleum Equipment Co. Ltd.Eco-Tec Ltd.Tianhe Oil Group Huifeng Petroleum Equipment Co. Ltd.Devon Energy Corp.TAM International, Inc.
Halliburton Energy Services, Inc.Clariant International AGHalliburton Co.Marathon Oil Co.CNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.China Oilfield Services Ltd.Ceca SAProgress Rail Locomotive, Inc.Vallourec SAEnventure Global Technology LLCC. & J. Clark International Ltd.CARBO Ceramics, Inc.Elliott Co.Progress Rail Services Corp.American Colloid Co.Packers Plus Energy Services, Inc.Trican Well Service Ltd.Hammelmann GmbHRPC, Inc.Innovex Downhole Solutions, Inc.Apache Corp.Gyrodata, Inc.Yantai Jereh Oilfield Services Group Co. Ltd.Yantai Jereh Oilfield Services Group Co. Ltd.Netzsch Gertebau GmbHWoodside Energy Ltd.Nexen Corp.Chimec SpALeistritz AG
Kubota Corp.Shin-Etsu Polymer Co., Ltd.Kurimoto Ltd.Xinxing Ductile Iron Pipes Co., Ltd.Wuhu Xinxing Ductile Iron Pipes Co., Ltd.Wuhu Xinxing Ductile Iron Pipes Co., Ltd.Vallourec SAUnited States Pipe & Foundry Co. LLCAdvanced Drainage Systems, Inc.Zhejiang Zhongcai Pipes Science & Technology Co. Ltd.American Cast Iron Pipe Co.Hebei Xinxing Ductile Iron Pipes Co. Ltd.Supreme Industries Ltd.Huangshi Xinxing Pipes Co., Ltd.Huangshi Xinxing Pipes Co., Ltd.Mercury Plastics LLCSaint-Gobain Construction Products UK Ltd.The Ford Meter Box Co., Inc.North American Pipe Corp.Kuo Toong International Co., Ltd.Prinsco, Inc.Perma-Pipe, Inc.Suns Pipelines Co., Ltd.Walter Coke, Inc.Angang Group Yongtong Ductile Cast Iron Pipe Co. Ltd.Charlotte Pipe & Foundry Co.Jindal SAW Ltd.Pexco LLCElectrosteel Castings Ltd.CANTEX, Inc.
Southwest Petroleum UniversityCabot Corp.Halliburton Co.Albemarle Corp.Kemira OyjM-I LLCOccidental Chemical Corp.Marathon Oil Co.CNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.Stepan Co.Croda International PlcHarima Chemicals Group, Inc.Ceca SALamberti SpADerrick Corp.Vallourec SASakamoto Yakuhin Kogyo Co., Ltd.PQ Corp.M-I Drilling Fluids U.K. Ltd.Occidental Petroleum Corp.Elliott Co.Elkem Silicones France SASOleon NVTrican Well Service Ltd.Hammelmann GmbHAnadarko Petroleum Corp.Innovex Downhole Solutions, Inc.Apache Corp.Brooks Instrument LLC
ConocoPhillipsSuncor Energy, Inc.Bucyrus International, Inc.CARBO Ceramics, Inc.Syncrude Canada Ltd.Imperial Oil Ltd.Scientific Drilling International, Inc.Trican Well Service Ltd.Cenovus Energy, Inc.Anadarko Petroleum Corp.RPC, Inc.Gyrodata, Inc.Valaris PlcDevon Energy Corp.Alberta Oil Sands Technology & Research AuthorityCalfrac Well Services Ltd.Canadian Natural Resources Ltd.MEG Energy Corp.Osum Oil Sands Corp.Equinor Canada Ltd.Wild Well Control, Inc.Total E&P Canada Ltd.EOG Resources, Inc.Blue Spark Energy, Inc.STEP Energy Services Ltd.Diamond Offshore Drilling, Inc.CVW CleanTech Inc.Canadian Oil Sands Investments, Inc.Conval, Inc.Athabasca Oil Corp.
Halliburton Co.CNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.Varco International, Inc.Daido Kogyo Co., Ltd.Camco International, Inc.Dril-Quip, Inc.C. & J. Clark International Ltd.Anton Oilfield Services (Group) Ltd.Trican Well Service Ltd.DynaEnergetics GmbH & Co. KGRPC, Inc.Innovex Downhole Solutions, Inc.Gyrodata, Inc.Valaris PlcTuboscope Vetco International, Inc.Tuboscope Vetco International, Inc.Centek Ltd.Tong Oil Tools Co., Ltd.Premier Coil Solutions, Inc.Bilco Tools, Inc.Calfrac Well Services Ltd.Stimline ASSchoeller-Bleckmann Oilfield Equipment AGAnTech Ltd.Rosneft Oil Co.Magnum Oil Tools International Ltd.Wenzel Downhole Tools Ltd.FHE USA LLCHydra-Rig, Inc.