30 C.F.R. § 57.11054
Current through September 30, 2024
Telephone or other voice communication shall be provided between the surface and refuge chambers and such systems shall be independent of the mine power supply.
30 C.F.R. §57.11054
Telephone or other voice communication shall be provided between the surface and refuge chambers and such systems shall be independent of the mine power supply.
30 C.F.R. §57.11054