MSHA - Code of Federal Regulations - 30 CFR 77.1902
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MSHA - Title 30 CFR
30 CFR § 77.1902
Drilling and mucking operations.


Diesel-powered equipment used in the drilling, mucking, or other excavation of any slope or shaft shall be permissible, and such equipment shall be operated in a permissible manner and shall be maintained in a permissible condition.