Code of Federal Regulations · Section

§ 57.19090 — Dual Signaling Systems

30 C.F.R. § 57.19090

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There shall be at least two effective approved methods 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. § 57.19083 30 C.F.R. § 57.19091

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