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Method of manufacturing a friction element
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Patent number 6,086,814
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Issue date Jul 11, 2000
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Deutsche Forschungsanstallt fur Luft-und Raumfahrt, E.V.
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Walter Krenkel
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Friction element
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Patent number 6,042,935
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Issue date Mar 28, 2000
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Deutsche Forschungsanstalt fuer Luft-ung Raumfahrt e.V.
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Walter Krenkel
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Brush contact for a vehicle
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Patent number 5,657,842
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Issue date Aug 19, 1997
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Deutsche Forschungsanstalt fur Luft und Raumfahrt B.V.
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Walter Krenkel
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B60 - VEHICLES IN GENERAL