MSHA - Code of Federal Regulations - 30 CFR 75.1600
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MSHA - Title 30 CFR
30 CFR § 75.1600


Telephone service or equivalent two-way communication facilities, approved by the Secretary or his authorized representative, shall be provided between the surface and each landing of main shafts and slopes and between the surface and each working section of any coal mine that is more than 100 feet from a portal.