Subject
Engineering
Equipment and supplies
Maintenance and repair
3
Oil fields
3
Petroleum engineering
3
Production methods
3
Design and construction
2
Electric machinery
2
Electric power-plants
2
Oil fieldsxEquipment and supplies
2
Piping
2
Air conditioning
1
Chemical plants
1
Computer-aided design
1
Fire pumps
1
Fires and fire prevention
1
Heating
1
Industrial buildings
1
Machinery
1
Milling machinery
1
Petroleum refineries
1
Pipelines
1
Ventilation
1
Vocational guidance
1