Subject
Equipment and supplies
Maintenance and repair
8
Air conditioning
5
Refrigeration and refrigerating machinery
5
Electric machinery
3
Engineering
3
Electric power-plants
2
Pumping machinery
2
Fire extinction
1
Fire pumps
1
Hydraulics
1
Hydronics
1
Machinery
1
Milling machinery
1
Petroleum engineering
1
Vocational guidance
1
Water-supply
1