30 C.F.R. § 75.1600 Communications.
Title 30 - Mineral Resources
[Statutory Provisions] 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.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart Q—Communications
§ 75.1600 Communications.
