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Novel combined drilling tool
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Screw drilling tool for petroleum drilling
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Sand prevention type oil-gas separator of screw drilling tool
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Deviational survey sucker rod
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Easy-to-mount sucker rod anti-abrasion device
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Sucker rod with wear automatic-compensation structure
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Sucker rod anti-abrasion device
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A kind of antidetonation helicoid hydraulic motor
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One kind can reaming helicoid hydraulic motor
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