(a) Each operator shall take five valid respirable dust samples from the designated occupation in each mechanized mining unit during each bimonthly period beginning with the bimonthly period of November 1, 1980. Designated occupation samples shall be collected on consecutive normal production shifts or normal production shifts each of which is worked on consecutive days. The bimonthly periods are:
CFR 30-70.207-2014由US-CFR-file 发布于 1993-12-02,并于 1993-12-02 实施。
CFR 30-70.207-2014 在中国标准分类中归属于: F00 标准化、质量管理。
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