1. Mechanics
2. Tubers
3. Foremen
4. Factory Workers
5. Machine Operators
6. Power House Technicians
7. Security Guards
8. Fitters
9. Engineers
10. Colliers or Helpers
11. Maintenance mechanics
12. Store keepers
1. Mechanics
2. Tubers
3. Foremen
4. Factory Workers
5. Machine Operators
6. Power House Technicians
7. Security Guards
8. Fitters
9. Engineers
10. Colliers or Helpers
11. Maintenance mechanics
12. Store keepers