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Henri Irrthum, Du Pont de Nemours International S.A., Geneva, has been named director of titanium dioxide (TiO2) operations for Du Pont's White Pigments and Mineral Products businesses with E.I. du Pont de Nemours and Company, Wilmington, Delaware, U.SA He succeeds Dennis H. Reilley, who was recently promoted to vice president and general manager — White Pigment and Mineral Products.