Associated Press
This December 2012 photo shows people touring the Caterpillar Visitors Center in Peoria, Ill. Caterpillar Inc. manufactures heavy equipment that bulldozes, digs, lifts and performs other tasks at construction and mining sites. The center lets visitors climb inside the machines for a closer look while computer simulations provide an opportunity to learn how to manipulate the controls. (AP Photo/Fritz Faerber)

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