** FILE ** In this July 27, 2011, photo, assembly line worker Sarah Lowidon moves a door into position for a Chevrolet Volt at the General Motors Hamtramck Assembly plant in Hamtramck, Mich. (AP Photo/Paul Sancya)
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** FILE ** In this July 27, 2011, photo, assembly line worker Sarah Lowidon moves a door into position for a Chevrolet Volt at the General Motors Hamtramck Assembly plant in Hamtramck, Mich. (AP Photo/Paul Sancya)
