For the first time in the company’s 163-year history, a U.S. president has visited a Siemens factory. On tuesday, during his tour of the Midwest, Barack Obama made a stop at the plant manufacturing components for wind power generation in Fort Madison in the U.S. state of Iowa. The plant, which was opened in mid-2007 and has recently been expanded, has a workforce of 600 employees and produces rotor blades for wind turbines.