§ 57.22201. Mechanical ventilation (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines).
6 words·~1 min read·
/us/cfr/t30/s§ 57.22201·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
All mines shall be ventilated mechanically.