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Movable bridge center lock
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Patent number 6,453,494
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Issue date Sep 24, 2002
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Terry L. Koglin
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Railroad highway crossing
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Patent number 5,474,266
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Issue date Dec 12, 1995
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Terry L. Koglin
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES