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Halliburton Energy Services, Inc.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 SATatsuno Corp.CNOOC Energy Technology & Services Ltd.Eneos Corp.Marathon Oil Co.Sanki Engineering Co., Ltd.
Kubota Corp.Hitachi Metals, Ltd.Proterial Ltd.Ryobi Ltd.Kurimoto Ltd.Xinxing Ductile Iron Pipes Co., Ltd.Wuhu Xinxing Ductile Iron Pipes Co., Ltd.Wuhu Xinxing Ductile Iron Pipes Co., Ltd.United States Pipe & Foundry Co. LLCMetso Minerals Industries, Inc.Consolidated Metco, Inc.American Cast Iron Pipe Co.Vinidex Pty Ltd.Hebei Xinxing Ductile Iron Pipes Co. Ltd.Kolbenschmidt Pierburg Shanghai Nonferrous Components Co., LtdKolbenschmidt Pierburg Shanghai Nonferrous Components Co., LtdHuangshi Xinxing Pipes Co., Ltd.Huangshi Xinxing Pipes Co., Ltd.Changzhou Huade Machine Co. Ltd.Gunite EMI Corp.HUA Dong Teksid Automotive Foundry Co., Ltd.HUA Dong Teksid Automotive Foundry Co., Ltd.Xinxing Ductile Iron Pipes Xinjiang Co., Ltd.Xinxing Ductile Iron Pipes Xinjiang Co., Ltd.Anhui Yingliu Electromechanical Co., Ltd.Shandong Huifeng Casting Technology Co., Ltd.Teksid SpAShandong Huifeng Casting Technology Co., Ltd.Anhui Yingliu Electromechanical Co., Ltd.Weifang 100Tong Casting 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.China National Offshore Oil Corp.China National Offshore Oil Corp.Schlumberger Canada Ltd.JSWChina General Nuclear Power Corp.China General Nuclear Power Corp.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.Elf Aquitaine Fertilisants