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In 2008, Dan Eberhart told his bosses at a Houston-based international oilfield service company that they should buy a small business supporting oil companies drilling in North Dakota’s booming Bakken field.
When they decided not to, Eberhart quit his job, found an investor and bought the company, Frontier Wellhead & Supply Co., in January 2009.
Since then, Eberhart, 33, and his company — Denver-based Frontier Energy Group LLC — have made seven more acquisitions of oilfield service companies…