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2185357
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Patent number 2,185,357
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Issue date Jan 2, 1940
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1573007
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Patent number 1,573,007
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Issue date Feb 16, 1926
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1400291
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Patent number 1,400,291
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Issue date Dec 13, 1921
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES