30 CFR 57.19090 - Dual signaling systems.

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§ 57.19090 Dual signaling systems.
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.

Title 30 published on 2014-07-01.

No entries appear in the Federal Register after this date, for 30 CFR Part 57.

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United States Code