MSHA - Code of Federal Regulations - 30 CFR 57.22302
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MSHA - Title 30 CFR
30 CFR § 57.22302
Approved equipment (I-A and V-A mines).

Equipment used in or beyond the last open crosscut shall be approved by MSHA under the applicable requirements of 30 CFR parts 18 through 36. Equipment shall not be operated in atmospheres containing 1.0 percent or more methane.

For more information: See MSHA'S Program Policy Manual