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3712187
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Patent number 3,712,187
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Issue date Jan 23, 1973
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3372096
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Patent number 3,372,096
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Issue date Mar 5, 1968
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3096695
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Patent number 3,096,695
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Issue date Jul 9, 1963
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES