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This Feb. 17, 2014 photo shows a drilling rig in Howard county, Texas as the sun sets. The federal Occupational Safety and Health Administration keeps a list of "the worst of the worst" employers in the nation and drilling companies with multiple fatalities should be on it, safety experts say. (AP Photo/Houston Chronicle, James Nielsen)

This Feb. 17, 2014 photo shows a drilling rig in Howard county, Texas as the sun sets. The federal Occupational Safety and Health Administration keeps a list of "the worst of the worst" employers in the nation and drilling companies with multiple fatalities should be on it, safety experts say. (AP Photo/Houston Chronicle, James Nielsen)

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