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CN111520105A
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Downhole safety valve
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Butt joint device for underground safety valve control pipelines
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Underground safety production device
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Oil pipe plugging device
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A kind of toe-end valve
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A kind of toe-end valve
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A kind of bleeder
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A kind of twin-well oil-pumping machine
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A kind of under balance pressure drilling Operating Pressure machine
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A kind of controllable bleeder
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A kind of be layered seeks production control tool
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A kind of retrievable storm valve opening tool
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A kind of non-return type storm valve opening tool
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CN108756813A
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A kind of storm valve opening tool
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