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A kind of hydraulic vibration fishing device
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A kind of tubing string internal cutter
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A kind of high-strength degradable ball seat
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A kind of greasy filth device for thinning
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A kind of down-hole string inner cutter
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CN107035336A
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A kind of automatic control blanking plug
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A kind of gaslift piston
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Underground controllable spray gun
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Underground slide sleeve opening device
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Downhole hollow oil well pump
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Oil well pump and oil production pipe column
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