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1847341
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Patent number 1,847,341
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Issue date Mar 1, 1932
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1665906
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Patent number 1,665,906
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Issue date Apr 10, 1928
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1545089
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Patent number 1,545,089
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Issue date Jul 7, 1925
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES