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對外層作業(yè)或在沙子, 礫石, 表層石頭, 表層粘土, 膠體磷酸鹽和表層石灰石礦作業(yè)的礦工的培訓(xùn)和再培訓(xùn)

時間: 2018-06-14

2017-07-01

30 CFR 46

Training and retraining of miners engaged in shell dredging or employed at sand, gravel, surface stone, surface clay, colloidal phosphate, or surface limestone mines.

2018-07-11