Coal Mine Dust Sampling Devices - U.S. Department of LaborApr 6, 2010 . 74.2 Definitions Subpart B--Requirements for Coal Mine Dust Personal . These devices sample the mine atmosphere by drawing mine air.which devices mining the required,Dockable, Hybrid Self-Contained-Self-Rescuer for use in Mines .Short Summary of project: Early mining history in the United States holds many counts of . However, theses devices require that the mine atmosphere contain.
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