Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 75.201
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MSHA - Title 30 CFR
30 CFR § 75.201

Definitions.

Automated temporary roof support (ATRS) system. A device to provide temporary roof support from a location where the equipment operator is protected from roof falls.

Pillar recovery. Any reduction in pillar size during retreat mining.




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