Koster, K.H.
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Univ Essen-GH, Dep of Conveying, Technology, Essen, West Ger, Univ Essen-GH, Dep of Conveying Technology, Essen, West Ger Univ Essen-GH, Dep of Conveying, Technology, Essen, West Ger, Univ Essen-GH, Dep of Conveying Technology, Essen, West Ger