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3460486
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Patent number 3,460,486
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Issue date Aug 12, 1969
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2877716
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Patent number 2,877,716
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Issue date Mar 17, 1959
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2819681
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Patent number 2,819,681
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Issue date Jan 14, 1958
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...