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Nittetsu Mining Co., Ltd.Calgon Carbon Corp.Minerals Technologies, Inc.Ube Material Industries Ltd.Maruo Calcium Co., Ltd.Imerys Pigments, Inc.Shiraishi Kogyo Kaisha Ltd.Okutama Kogyo Co., Ltd.Showa Chemical Industry Co., Ltd.EP Minerals LLCSCHAEFER KALK GmbH & Co. KGFels-Werke GmbHImerys SAMineral Technologies Pty Ltd.Mississippi Lime Co.Covia Holdings LLCAbsorbent Products Ltd.E. Dillon & Co.Nordkalk Oy AbCarmeuse SAShanghai Yaohua Nano Tech Co. Ltd.Nitto Funka Kogyo KK
W. R. Grace & Co.-Conn.Heraeus Quarzglas GmbH & Co. KGAllnex Belgium SAMultisorb Technologies, Inc.PQ Corp.Fuso Chemical Co., Ltd.Fuji Silysia Chemical Ltd.Solvay USA, Inc.University of Maria Curie-sklodowskaShowa Chemical Industry Co., Ltd.Nippon Aerosil Co., Ltd.Quechen Silicon Chemical Co., Ltd.Gelest, Inc.EP Minerals LLCYichang CSG Polysilicon Co., Ltd.AGC SI-Tech Co. Ltd.Nissan Chemical America Corp.Zeochem AGTosoh Silica Corp.Imerys SARhodia Brasil SASiliCycle, Inc.Shanxi Tond Chemical Co., Ltd.Longxing Chemical Stock Co., Ltd.Shandong Sinchem Silica Gel Co., Ltd.Desiccare, Inc.Chemiewerk Bad Köstritz GmbHZhejiang Jinggong New Material Technology Co. Ltd.Evonik Wellink Silica Nanping Co. Ltd.Evonik Wellink Silica Nanping Co. Ltd.
Southwest Petroleum UniversityCabot Corp.Halliburton Co.Kemira OyjAlbemarle Corp.M-I LLCCNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.Harima Chemicals Group, Inc.Lamberti 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 SASNikko Chemicals Co., Ltd.Oleon NVTrican Well Service Ltd.Hammelmann GmbHAnadarko Petroleum Corp.Innovex Downhole Solutions, Inc.Apache Corp.Brooks Instrument LLCNetzsch Gertebau GmbHNexen Corp.Chimec SpALeistritz AG
JFE Steel Corp.CNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.Vallourec 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.voestalpine Tubulars GmbH & Co. KGShanxi Fenglei Drilling Tools Co. Ltd.
ConocoPhillipsSmith International, Inc.Saipem SpACNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.Tracto Technik GmbH & Co. KGHerrenknecht AGElliott Co.Membrane Technology & Research, Inc.Scientific Drilling International, Inc.Trican Well Service Ltd.Hammelmann GmbHAnadarko Petroleum Corp.Maersk Drilling A/SApache Corp.Gyrodata, Inc.Yantai Jereh Oilfield Services Group Co. Ltd.Valaris PlcBeijing Liuhe Greatness Technology Co., Ltd.Yantai Jereh Oilfield Services Group Co. Ltd.Beijing Liuhe Greatness Technology Co., Ltd.Netzsch Gertebau GmbHNexen Corp.Chimec SpALeistritz AGMotive Drilling Technologies, Inc.DI Corp.Eco-Tec Ltd.Devon Energy Corp.TAM International, Inc.
Osaka Gas Co., Ltd.Kureha Corp.Cabot Corp.Albemarle Corp.MeadWestvaco Corp.Tokai Carbon Co., Ltd.Calgon Carbon Corp.Hayward Industries, Inc.Mahle-Metal Leve SAMacauto Industrial Co. Ltd.Kuraray Chemical Co., Ltd.Shenwu Environmental Technology Co., Ltd.Shenwu Environmental Technology Co., Ltd.Thomas Swan & Co. LtdVorbeck Materials Corp.Graphene Platform Corp.Monolith Materials, Inc.Jinneng Science & Technology Co., Ltd.Asahi Carbon Co. Ltd.Awa Paper & Technological Co., Inc.Awa Paper & Technological Co., Inc.Jinneng Science & Technology Co., Ltd.Donau Chemie AGNingxia Xinlong Bluesky Technology Co., Ltd.SDP Global Co., Ltd.SweetWater Energy , Inc.Ningbo Co-star Materials Hi-Tech Co. Ltd.Ningbo Co-star Materials Hi-Tech Co. Ltd.Jiangxi Black Cat Carbon Black Co., Ltd.Jiangxi Black Cat Carbon Black Co., Ltd.
Halliburton Co.Smith International, Inc.O & K Orenstein & Koppel AGCNPC Bohai Drilling Engineering Co. Ltd.CNPC Bohai Drilling Engineering Co. Ltd.Sany Heavy Equipment Co., Ltd.Caterpillar Paving Products, Inc.DePuy Mitek LLCLamberti SpAEpiroc Rock Drills ABDril-Quip, Inc.US Synthetic Corp.Tianjin Cement Industry Design & Research Institute Co., Ltd.Shanghai SK Petroleum & Chemical Equipment Corp. Ltd.Herrenknecht AGHenan Huanghe Whirlwind Co., Ltd.Elliott Co.Evolution Engineering, Inc.Membrane Technology & Research, Inc.Grant Prideco, Inc.Case New Holland Italia SpALingong Heavy Machinery Co., Ltd.Gottwald Port Technology GmbHLingong Group Jinan Heavy Machinery Co. Ltd.Scientific Drilling International, Inc.Precision Energy Services Ltd.Trican Well Service Ltd.Wacker Construction Equipment AGHammelmann GmbHAnadarko Petroleum Corp.