MSHA - Code of Federal Regulations - 30 CFR 57.7801
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MSHA - Title 30 CFR
30 CFR § 57.7801
Jet drills.


ROTARY JET PIERCING--SURFACE ONLY

Jet piercing drills shall be provided with:

(a) A system to pressurize the equipment operator's cab, when a cab is provided; and

(b) A protective cover over the oxygen flow indicator.