 WEATHERFORD HOLDINGS (SINGAPORE) PTE. LTD. (Singapore)
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WEATHERFORD ASIA PACIFIC PTE LTD (Singapore)
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 KEY INTERNATIONAL DRILLING COMPANY LIMITED (Bermuda)
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Secure Drilling International, L.P. (Bermuda)
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Secure Drilling Holding Ltd. (Bermuda)
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 Precision Drilling International B.V. (Netherlands)
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 PRECISION ENERGY SERVICES (BARBADOS) LTD. (Barbados)
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Precision Energy Services (New Zealand) Limited (New Zealand)
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Contra-Shear Separation Technologies Limited (New Zealand)
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Directional Wireline Engineering Services (Nigeria) Limited (Nigeria)
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e2 Tech Limited (United Kingdom)
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 COLUMBIA OILFIELD SUPPLY, INC. (Delaware (US))
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Drilling Research & Development Corporation (Texas (US))
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Chengdu Minjiang Weatherford Petroleum Machinery Manufacture Co., Ltd. (China)
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 WEATHERFORD DRILLING AND PRODUCTION SERVICES (INDIA) PRIVATE LIMITED (India)
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ResLab Reservoir Laboratories & Company LLC (Oman)
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Precision Drilling (Egypt) LLC (Egypt)
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International Logging S.A. (Nevada (US))
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Datalog Services de Petroleo do Brazil Ltda. (Brazil)
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DISCOVERY LOGGING, INC. (Texas (US))
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