Drill Collar Top Companies
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Workstrings International
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Hunting PLC
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National Oilwell Varco
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International Drilling Services Ltd. (IDS)
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American Oilfield Tools, Inc.
*Disclaimer: Top companies sorted in no particular order
Drill Collar Market Concentration
Drill Collar Company List
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Hunting PLC
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China Vigor Drilling Oil Tools and Equipment Co. Ltd
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International Drilling Services Ltd (IDS)
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Schoeller-Bleckmann Oilfield Equipment AG
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National Oilwell Varco Inc. (NOV)
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Schlumberger Limited
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Zhong Yuan Special Steel Co. Ltd
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American Oilfield Tools Inc.
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Workstrings International
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Texas Steel Conversion Inc. (TSC)
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Challenger International Inc.
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