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3292508
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Patent number 3,292,508
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Issue date Dec 20, 1966
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1824524
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Patent number 1,824,524
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Issue date Sep 22, 1931
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1573923
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Patent number 1,573,923
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Issue date Feb 23, 1926
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES