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3270633
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Patent number 3,270,633
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Issue date Sep 6, 1966
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2374732
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Patent number 2,374,732
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Issue date May 1, 1945
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2197878
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Patent number 2,197,878
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Issue date Apr 23, 1940
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES