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3444822
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Patent number 3,444,822
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Issue date May 20, 1969
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3417708
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Patent number 3,417,708
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Issue date Dec 24, 1968
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1742951
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Patent number 1,742,951
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Issue date Jan 7, 1930
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES