[Statutory Provisions]
There shall be at least two effective methods approved by the Secretary of signaling between each of the shaft stations and the hoist room, one of which shall be a telephone or speaking tube.
30 C.F.R. §75.1402
[Statutory Provisions]
There shall be at least two effective methods approved by the Secretary of signaling between each of the shaft stations and the hoist room, one of which shall be a telephone or speaking tube.
30 C.F.R. §75.1402