01278nam 2200349 450 991070455720332120130604101958.0(CKB)5470000002442132(OCoLC)841580222(EXLCZ)99547000000244213220130503d2012 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierDistrict field change requests for adding proximity detection systems[Arlington, Virginia] :[U.S. Department of Labor, Mine Safety and Health Adminstration],2012.1 online resource (3 pages)Procedure instruction letter ;no. I12-V-19Title from subject line (viewed on May 3, 2013)."Effective Date: 07/26/2012, Expiration Date: 03/31/2014."Mining machinerySafety regulationsUnited StatesMine safetySafety regulationsUnited StatesMining machinerySafety regulationsMine safetySafety regulationsGPOGPOBOOK9910704557203321District field change requests for adding proximity detection systems3259402UNINA