This combination of Associated Press file photos shows a worker, left, assembling 

This combination of Associated Press file photos shows a worker, left, assembling a motor in a Mercedes Benz factory in 2008 in Berlin, and a robot, right, painting a brake drum at Webb Wheel Products, in 2013, in Cullman, Ala.. Thanks to robots, Webb Wheel hasn't added a factory worker in over three years, though it's making 300,000 more drums annually, a 25 percent increase. (AP Photo)
Associated Press
This combination of Associated Press file photos shows a worker, left, assembling a motor in a Mercedes Benz factory in 2008 in Berlin, and a robot, right, painting a brake drum at Webb Wheel Products, in 2013, in Cullman, Ala.. Thanks to robots, Webb Wheel hasn't added a factory worker in over three years, though it's making 300,000 more drums annually, a 25 percent increase. (AP Photo)
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