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A kind of manufacturing method and device of the compound railway frog of endurance
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A kind of groove profile rail reinforced structure
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Railway switch structure and rail system for rubber road junction
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A kind of railway switch is with end structure and railway switch
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A kind of wear-resisting steel fork core structure
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A kind of steel alloy of excellent combination property and preparation method thereof
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Backing plate drilling tool and hole-drilling system
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A kind of 20Cr3MoWV Heat-Treatment of Steel method
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A kind of 35CrMo Heat-Treatment of Steel method
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High-performance alloy steel and manufacturing method thereof
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High-strength alloy steel point rail and wing rail assembling type combined frog
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