Assembly-line workers install dashboard air vents on a 2012 Ford ...

AP FILE PHOTO, DEC. 14, 2011 | published: January 19, 2012

Assembly-line workers install dashboard air vents on a 2012 Ford Focus at the Ford Michigan Assembly plant in Wayne, Mich. U.S. factories roared to life in December, creating sharply more goods to meet strong demand for business equipment, materials, vehicles and energy.