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composite girder which uses a filled steel pipe as a web member and ties and connects with a steel wire
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steel girder bridge of slab concrete section used as compression member and progreprestressed
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safety helmet with attachable personal belongings and tool
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ground expansion drilling methods and equipment using metal ball shooted by compressed air
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tension indicatable earth ancher for ground reinforcement
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Multifunctional heating panels
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The launching and removing method of hanging scaffold for bridge slab using rail and roller type device
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Method for painting a car
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