AUBURN — Maine Oxy President and CEO Dan Guerin in mid-December took full ownership of the Auburn-based medical, industrial and specialty gas company, according to Carl Paine, the company’s business development manager.

The firm had been employee-owned since 2004. Guerin first took a 51 percent stake in October 2012.

Guerin told Mainebiz last month that when he purchased the company, he vowed to keep it independent (story appeared in the Sun Journal on Dec. 26). But that left continued employee ownership in question.

The terms of the most recent sale were not disclosed. The company’s revenue this year was $38 million.

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