Schwanau, March 22, 2011. Dr. Bernd Pfaffenbach (2nd from r.), state secretary in the Federal Ministry for Economics and Technology, has today visited Herrenknecht AG in order to inform himself about the current state of machine-operated tunnelling technology and the company's international project operations. Dr.-Ing. E. h. Martin Herrenknecht (2nd from l.), Chairman of the Board of Management of Herrenknecht AG, guided him around the company premises in Schwanau together with his colleagues, Gebhard Lehmann, Deputy Chairman of the Board of Management (r.) and Kurt Stiefel, Chief Financial Officer (l.).