MSHA - Code of Federal Regulations - 30 CFR 56.19107
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MSHA - Title 30 CFR
30 CFR § 56.19107
Precautions for work in compartment affected by hoisting operation.

Hoistmen shall be informed when persons are working in a compartment affected by that hoisting operation and a "Men Working in Shaft" sign shall be posted at the hoist.