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Threaded bar
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Patent number 4,811,541
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Issue date Mar 14, 1989
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Ulrich Finsterwalder
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Tension-band bridge
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Patent number 4,480,348
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Issue date Nov 6, 1984
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Ulrich Finsterwalder
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES