Coal Mine Health and Safety: Hearings ... Ninety-first Congress, First Session, on S. 355 [and Others] ...U.S. Government Printing Office, 1969 |
Συχνά εμφανιζόμενοι όροι και φράσεις
bits 0 Cause BLACKWELL blasting BOGGS Bureau of Mines carbide lamp carbide-tipped bits centum Chairman circuit Classification Source Coal Board coal dust COAL MINE IGNITIONS Coal Mine Safety collieries committee continuous miner bits cutting machine bits date State Classification electric arc emitted when bits equipment examination Federal Coal feet flame safety lamp frictional sparks gassy continuous miner gassy cutting machine gassy explosives gassy mines GOUGH hazard health and safety ignited gas ignited methane ignition Fatal Nonfatal IGNITIONS AND EXPLOSIONS industry inspection inspector kerf Linkous loading machine locomotive lung Medical methane at face Methane ignited Methane was ignited milligrams MITTELMAN MULLINS National Coal Board nongassy nonpermissible O'LEARY open flame operator permissible persons pneumoconiosis RALPH NADER rock dust roof fall Secretary Senator RANDOLPH Senator WILLIAMS silicosis Source of ignition Sparks created Sparks emitted standards tion trailing cable U.S. Senate UNDERGROUND COAL ventilation X-ray