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Short radius culvert sections
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Patent number 5,375,943
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Issue date Dec 27, 1994
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Wilson; Michael W.
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Thomas C. McCavour
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Reinforced metal box culvert
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Patent number 5,326,191
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Issue date Jul 5, 1994
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Wilson; Michael M.
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Michael W. Wilson
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES