** FILE ** ThyssenKrupp chairman of the supervisory board Gerhard Cromme is seen in this Dec. 18, 2001 file picture taken in Duesseldorf. Siemens said Thursday April 19, 2007 Heinrich von Pierer was stepping down and would give up his post as chairman of the supervisory board at the next board meeting on April 25. Siemens said board member Gerhard Cromme would be nominated to take over the rest of von Pierer's term that ends in 2008. (AP Photo/Martin Meissner)