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2313820
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Patent number 2,313,820
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Issue date Mar 16, 1943
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2016159
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Patent number 2,016,159
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Issue date Oct 1, 1935
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1975902
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Patent number 1,975,902
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Issue date Oct 9, 1934
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1934073
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Patent number 1,934,073
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Issue date Nov 7, 1933
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1516774
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Patent number 1,516,774
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Issue date Nov 25, 1924
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES