The Opel car plant in Bochum, Germany, in May 2012. General Motors was pressed by unions Friday to respect job pledges at its German unit Opel after the shock resignation of its chief executive and as

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The Opel car plant in Bochum, Germany, in May 2012. General Motors was pressed by unions Friday to respect job pledges at its German unit Opel after the shock resignation of its chief executive and as Europe's car sector struggles with overcapacity.

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