MSHA - Code of Federal Regulations - 30 CFR 57.14110
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MSHA - Title 30 CFR
30 CFR § 57.14110
Flying or falling materials.

In areas where flying or falling materials generated from the operation of screens, crushers, or conveyors present a hazard, guards, shields, or other devices that provide protection against such flying or falling materials shall be provided to protect persons.