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Steel grating with automatic opening and closing by rain
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Reversible lane operating system for tunnel
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The inlet well cover in which draining function is improved
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The inlet well cover for anti-skid
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Bridge post foundation construction method
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The wall for the bridge post foundation construction
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The manhole for oil-fire prevention in the tunnel
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The construction of waterway for tunnel
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Reclaimed form for constructing hollow pire
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Construction method of hollow pire using reclaimed form
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Pile structure of deep foundation
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Apparatus for reducing of friction
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Filling crushed stone type retainingwall
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Scaffold for high load
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Assembling method of scaffold and the device
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