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Marking system
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Patent number 4,682,910
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Issue date Jul 28, 1987
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Edmund D. Hollon
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Track surface laying
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Patent number 4,465,397
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Issue date Aug 14, 1984
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Edmund D. Hollon
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES