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Reversing ball valve for fluid steering and use method thereof
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Spraying device for large site and using method thereof
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Y-shaped three-way connecting piece with ball valve and using method thereof
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Three-way connecting piece with temperature sensor and use method thereof
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Dustproof atomizer that cools down
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Bracket type liquid feeding and returning three-way pipe used for underground coal mine and using method thereof
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Four-way welding tool
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Spraying device for fire extinguishment
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A filtration type connects for ball valve
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Forming device of special mining machinery receiver pin
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A kind of drilling device improving working efficiency
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One kind having prevented dirt drilling device
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Multi-layer type drilling device
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Efficient high-precision drilling system
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Novel object drilling equipment
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Convenient impurity removing type drilling device
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Double-sided drilling device for metal plate
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High-precision multi-station drilling device
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Continuous drilling and tapping device of workpieces
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Synchronous steel pipe drilling device with multiple actuating mechanisms
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