MSHA - Code of Federal Regulations - 30 CFR 77.1012
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MSHA - Title 30 CFR
30 CFR § 77.1012
Jackhammers; operation; safeguards.

Men operating or working near jackhammers or jackleg drills, or other drilling machines shall position themselves so that they will not be struck or lose their balance if the drill steel breaks or sticks.