MSHA - Code of Federal Regulations - 30 CFR 57.19045
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MSHA - Title 30 CFR
30 CFR § 57.19045
Metal bonnets.


CONVEYANCES

Man cages and skips used for hoisting or lowering employees or other persons in any vertical shaft or any incline shaft with an angle of inclination of forty-five degrees from the horizontal, shall be covered with a metal bonnet.


For more information: See MSHA'S Program Policy Manual