Kelas utama
2X
Divisi
Seksi
- 620Engineering & allied operations1
- 621Applied physics2
- 622Mining & related operations
- 623Military & nautical engineering
- 624Civil engineering
- 625Engineering of railroads & roads
- 626[Unassigned]
- 627Hydraulic engineering
- 628Sanitary & municipal engineering
- 629Other branches of engineering