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2346930
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Patent number 2,346,930
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Issue date Apr 18, 1944
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2192284
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Patent number 2,192,284
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Issue date Mar 5, 1940
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2134357
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Patent number 2,134,357
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Issue date Oct 25, 1938
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1773788
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Patent number 1,773,788
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Issue date Aug 26, 1930
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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40649
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Patent number 40,649
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Issue date Nov 17, 1863
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES