MSHA - Code of Federal Regulations - 30 CFR 57.9260
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MSHA - Title 30 CFR
30 CFR § 57.9260
Supplies, materials, and tools on mantrips.

Supplies, materials, and tools, other than small items that can be carried by hand, shall not be transported underground with persons in mantrips. Mantrips shall be operated independently of ore or supply trips.