In this July 27, 2011 photo, assembly line worker Jan Primm manuevers a door into position for a 2012 Chevrolet Volt at the General Motors Hamtramck Assembly plant in Hamtramck, Mich. A private trade group says manufacturing activity barely grew in July, falling to the weakest level since just after the recession ended.(AP Photo/Paul Sancya)

Associated Press
In this July 27, 2011 photo, assembly line worker Jan Primm manuevers a door into position for a 2012 Chevrolet Volt at the General Motors Hamtramck Assembly plant in Hamtramck, Mich. A private trade group says manufacturing activity barely grew in July, falling to the weakest level since just after the recession ended.(AP Photo/Paul Sancya)
In this July 27, 2011 photo, assembly line worker Jan Primm manuevers a door into position for a 2012 Chevrolet Volt at the General Motors Hamtramck Assembly plant in Hamtramck, Mich. A private trade group says manufacturing activity barely grew in July, falling to the weakest level since just after the recession ended.(AP Photo/Paul Sancya)
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