MSHA - Code of Federal Regulations - 30 CFR 77.309
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MSHA - Title 30 CFR
30 CFR § 77.309
Visual check of system equipment.

Frequent visual checks shall be made by the operator of the thermal dryer system control station, or by some other competent person, of the bypass dampers, air-tempering louvers, discharge mechanism, and other dryer system equipment.