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By-pass air return extra-large inclination angle medium-thickness coal seam caving coal mining system
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Method and system for mining top coal of medium-thickness coal seam with extra-large dip angle
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Directional construction track measuring and correcting device for rotary drill rod
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One kind is impulsed pressure break coal petrography permeability improvement device and method with blasting fume shock wave
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A kind of comprehensive slewing equipment of double leval jib lifting
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Bag type paste blowout prevention hole sealing device
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Drill bit stablizes binary channels and receives slag-draining device
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Air pulsing quantum energy is implanted into presplitting permeability-increasing gas pumping method and device
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Interior deslagging deep hole pressure-relief drill rig
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Interior deslagging binary channels drilling rod
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Roll-in cut drill
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It is a kind of using gas as the anti-reflection technology of pulsation pressure break creep and its device of medium
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Elastic pouch hole packer
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The self-positioning drilling rod of binary channels
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Using air as the anti-reflection technology of pulsating pressure-air creep pressure break and device of medium
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Roller screen formula oil-water separator
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Plate-type condensation convex lens
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Multi-tube heat exchanger
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Concentrating solar heat collecting panel
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4-tooth 3-pitch scraper conveyor
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