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MSHA -  Title 30 CFR
30 CFR §62.160


 Hearing protectors

(a) A mine operator must provide a hearing protector to a miner whose noise exposure equals or exceeds the action level under §62.120 of this part. In addition, the mine operator must:

(b) The mine operator must ensure, after satisfying the requirements of paragraph (a) of this section, that a miner wears a hearing protector whenever the miner's noise exposure exceeds the permissible exposure level before the implementation of engineering and administrative controls, or if the miner's noise exposure continues to exceed the permissible exposure level despite the use of all feasible engineering and administrative controls.

(c) The mine operator must ensure, after satisfying the requirements of paragraph (a) of this section, that a miner wears a hearing protector when the miner's noise exposure is at or above the action level, if: