01351nam 2200337Ka 450 991069640640332120080403151739.0(CKB)5470000002378782(OCoLC)218513427(EXLCZ)99547000000237878220080403d2000 ua 0engtxtrdacontentcrdamediacrrdacarrierControlled start for drill motors on roof bolting machines[electronic resource][Pittsburgh, PA] :U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health,[2000]4 unnumbered pages digital, PDF fileTechnology news ;no. 480Title from title screen (viewed on Mar. 12, 2008)."Milestones in Mining Safety and Health Technology.""January 2000."Mine roof boltingEquipment and suppliesMine roof boltingEquipment and supplies.Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)GPOGPOBOOK9910696406403321Controlled start for drill motors on roof bolting machines3109921UNINA