The deadly blast at the U.S. Steel facility outside Pittsburgh was just the latest in a series of recent workplace accidents.By Kiley BenseIn the aftermath of an explosion at U.S. Steel’s Clairton Coke Works that injured 20 workers in July 2010, the Allegheny County emergency management chief was grateful it hadn’t been worse. “By the grace of God, nobody’s dead,” Robert A. Full said. “It’s a miracle no one was killed.”

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