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A kind of oil/gas well screen casing shearing ball seat
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A kind of hydraulic control sliding sleeve
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A kind of down-hole liquid sampling instrument
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A kind of multichannel Oil/gas Well production packer
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Annular hydraulic control safety valve
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Counting device and multistage all-diameter ball injection sliding sleeve device
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Counting device and multi-stage full-drift-diameter injection ball sliding sleeve device
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Staged fracturing apparatus with full-bore ball throwing sliding sleeve
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Sliding sleeve for mining oil-gas well in layering manner
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Subsurface safety valve
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