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Resilient marker
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Patent number 4,445,803
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Issue date May 1, 1984
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Byron P. Dixon
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Road marker
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Patent number 4,362,425
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Issue date Dec 7, 1982
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Byron P. Dixon
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES