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Code · CFR · Title 30 — Mineral Resources · Part 56 · § 56.19090

§ 56.19090. Dual signaling systems.

31 words·~1 min read·/us/cfr/t30/s§ 56.19090·

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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.
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§ 56.19090
Dual signaling systems.
Fed. Reg.×4
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