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A kind of hydraulic pin extraction device of pumping unit horsehead
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A kind of downhole rotational-flow desander
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A kind of spiral core bit
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A kind of novel drill rod float valve
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A kind of desander
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A kind of well drilling hoist of rope arranging automatically
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A kind of oil pick-up tube friction prevention device
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A kind of pressure-resistant anti-clogging side-suction type sand-settling device
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A kind of spiral-flow type sand-settling device
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A kind of oil pump vortex type high-efficient sand-settling device
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A kind of high vacuum insulated tubing
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Backwash cycles valve
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Solution-preparing jet device
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Hydraulic motor assembly with automatic drilling tool abrasion compensation function
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Hydraulic vibration type screw drill
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Scraping and centralizing stabilizer
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High-strength low-torque plug valve
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Pressure drilling device of drilling machine
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Nano-metal centralizer
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Rotating anti-eccentric wear sucker rod coupling
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