A Lufkin Industries Inc. Mark II Unitorque electric pumping unit removes crude oil from a Fidelity Exploration & Production Co. well outside South Heart, North Dakota, on Feb. 10, 2012. Photographer: Daniel Acker/Bloomberg
A Lufkin Industries Inc. Mark II Unitorque electric pumping unit removes crude oil from a Fidelity Exploration & Production Co. well outside South Heart, North Dakota, on Feb. 10, 2012. Photographer: Daniel Acker/Bloomberg
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