MSHA - Code of Federal Regulations - 30 CFR 57.20032
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MSHA - Title 30 CFR 30 CFR § 57.20032
Two-way communication equipment for underground operations.
Telephones or other two-way communication equipment with instructions for their use shall be provided for communication from underground operations to the surface.
AUTHORITY: 30 U.S.C. 811.
SOURCE: 52 FR 24941, July 1, 1987, unless otherwise noted.