北米の掘削および完成液トップ企業
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Schlumberger Limited
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Baker Hughes - A GE Company
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Halliburton Company
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National-Oilwell Varco Inc.
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CES Energy Solutions Corp
*免責事項:上位企業は順不同
Schlumberger Limited
Baker Hughes - A GE Company
Halliburton Company
National-Oilwell Varco Inc.
CES Energy Solutions Corp
*免責事項:上位企業は順不同