roof control meaning in Hindi

Examples

1. Four regular inspectors monitor the 20 mines in the area, along with three other inspectors who specialize in noise, electrical systems and roof control.
2. Students are exposed to a variety of different disciplines in nine different laboratories : roof control, ground control, mine emergencies and rescue, ventilation, electrical systems, machinery, industrial hygiene, computer systems and underground mine simulation.
3. An independent review of MSHA s role in Crandall Canyon by retired MSHA managers Earnest Teaster and Joseph Pavlovich, found that the agency failed to properly consider bounce activity in the mine prior to approving the mining plan, failed to properly evaluate the roof control plan and failed to follow established mine rescue protocols at all times at Crandall Canyon Mine.
4. From early July to late September, MSHA found 70 violations, 42 of which were S & S . MSHA inspections from early October to late December resulted in 46 citations and three orders, 18 of which were S & S . Violations include failure to follow the approved roof control and mine ventilation plans and problems concerning emergency escapeways and required pre-shift safety examinations.