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Direct-connection type oil casing
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Pipeline pipe
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Oil casing
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A kind of helicoid hydraulic motor anti-lost motor and helicoid hydraulic motor
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A kind of novel conjoined water cap formula universal shaft and helicoid hydraulic motor
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A kind of novel universal sheath shaft erector
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A kind of offshore drill uses riser pipe special thread female joint
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Special water insulation guide tube screwed joint for ocean drilling and exploitation
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Novel screw drilling tool bypass valve
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Corrosion-resistant oil casing coupling made of pure steel
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Corrosion-resistant oil casing pipe made of pure steel
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