C.F.R. » Title 30 » CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR › SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH › PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES › Subpart S—Miscellaneous

30 C.F.R. § 57.20032

Two-way communication equipment for underground operations

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Telephones or other two-way communication equipment with instructions for their use shall be provided for communication from underground operations to the surface.