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Signaling device
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Patent number 5,168,827
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Issue date Dec 8, 1992
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Wilhelm Junker
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Portable traffic marker
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Patent number 4,799,448
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Issue date Jan 24, 1989
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Wilhelm Junker
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES