General Motors Corp.

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FILE - In this Tuesday, Jan. 9, 2007, file photo, General Motors Corp.'s plug-in, rechargeable electric-powered Chevrolet Volt is displayed at the North American International Auto Show in Detroit. GM’s revolutionary electric car with a backup gas engine debuted as a sexy concept in 2007, GM made significant design changes to improve the car’s efficiency, but the Volt went on sale in 2010. (AP Photo/Carlos Osorio, File)