The changes were first proposed less than a year after the Upper Big Branch mine exploded in April 2010, killing 29 men.
http://www.sunherald.com/2013/01/17/4412404/feds-ok-rules-they-say-will-improve.html#storylink=rss
http://www.sunherald.com/2013/01/17/4412404/feds-ok-rules-they-say-will-improve.html#storylink=rss
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