MSHA - Code of Federal Regulations - 30 CFR 57.16017
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MSHA - Title 30 CFR
30 CFR § 57.16017
Hoisting heavy equipment or material.

Where the stretching or contraction of a hoist rope could create a hazard, chairs or other suitable blocking shall be used to support conveyances at shaft landings before heavy equipment or material is loaded or unloaded.

Subpart P--Illumination