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1625563
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Patent number 1,625,563
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Issue date Apr 19, 1927
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1327645
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Patent number 1,327,645
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Issue date Jan 13, 1920
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1328026
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Patent number 1,328,026
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Issue date Jan 13, 1920
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES