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Screen cleaner digger chain
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Double X-ray negative film radiographing method
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Method for restraining internal oxidation in gear deep carburizing and quenching process
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Locomotive vehicle axle crack depth measuring method
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Impregnation and repair heat treatment method for carburized gear
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Nozzle cooling protection device for natural gas heating furnace
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Line marking accurate-adjustment device and link marking method adopting line marking accurate-adjustment device
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Discharging device and discharging method of suspended centrifugal casting machine
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Steel grain refining heat treatment method for heavy-load locomotive gear
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Composite carburizing and quenching heat treatment method of gear
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