Seals and stoppings (III, V-A, and V-B mines).
57.22219
Seals and stoppings (II-A mines).
57.22220
Air passing unsealed areas (I-A, II-A, III, and V-A mines).
57.22221
Overcast and undercast construction (I-A, II-A, III, and V-A mines).
57.22222
Ventilation materials (I-A, I-B, I-C, II-A, III, V-A, and V-B mines).
57.22223
Crosscuts before abandonment (III mines).
57.22224
Auxiliary equipment stations (I-A and III mines).
57.22225
Auxiliary equipment stations (I-C mines).
57.22226
Testing for methane (IV mines).
57.22227
Approved testing devices (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines).
57.22228
Preshift examination (I-A, I-C, II-A, III, and V-A mines).
57.22229
Weekly testing (I-A, III, and V-A mines).
57.22230
Weekly testing (II-A mines.
57.22231