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Tunnel construction
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Patent number 4,889,448
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Issue date Dec 26, 1989
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Noel G. Bell
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Traveling trench shore
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Patent number 4,695,204
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Issue date Sep 22, 1987
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Noel G. Bell
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Trench shoring apparatus
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Patent number 4,548,528
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Issue date Oct 22, 1985
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Noel G. Bell
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Traveling trench shore
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Patent number 4,547,097
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Issue date Oct 15, 1985
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Noel G. Bell
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING