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NIOSH research developed a drill steel enclosure that can reduce the noise from drilling when using a roof bolting machine.
Suggested citation
NIOSH [2008]. Technology News 532 - collapsible drill steel enclosure for reducing roof bolting machine drilling noise. Pittsburgh, PA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2008-146, https://www.cdc.gov\niosh\docs\mining\works\coversheet1158.html
