30 C.F.R. § 57.20032 Two-way communication equipment for underground operations.
Title 30 - Mineral Resources
Telephones or other two-way communication equipment with instructions for their use shall be provided for communication from underground operations to the surface.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart S—Miscellaneous
§ 57.20032 Two-way communication equipment for underground operations.
