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Marathon Oil Corporation (NYSE: MRO) is an independent international exploration and production company. Based in Houston, Texas, Marathon Oil had net proved reserves at the end of 2011 of 1.8 billion barrels of oil equivalent in North America, Europe and Africa.
Petroleum Center Inc is a Thibodaux, LA-based company in the Energy and Utilities sector.
Welltec is an international provider of robotic well solutions for the oil and gas industry.
Black Raven Energy is a Denver, CO-based company in the Energy and Utilities sector.