MSHA - Code of Federal Regulations - 30 CFR 57.19080
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MSHA - Title 30 CFR
30 CFR § 57.19080
Hoisting tools, timbers, and other materials.

When tools, timbers, or other materials are being lowered or raised in a shaft by means of a bucket, skip, or cage, they shall be secured or so placed that they will not strike the sides of the shaft.