Category: Technology (T)
- General engineering (TA) 55
- Hydraulic and ocean engineering. (TC) 44
- Environmental technology, Sanitary engineering (TD) 27
- Highway engineering (roads and pavements) (TE) 6
- Railroad engineering and operation (TF) 34
- Bridge engineering (TG) 5
- Building construction (TH) 47
- Mechanical engineering and machinery (TJ) 72
- Electrical engineering, Electronics, Nuclear engineering (TK) 78
- Motor vehicles, Aeronautics, Astronautics (TL) 120
- Mining engineering, Metallurgy (TN) 51
- Chemical technology (TP) 90
- Photography (TR) 44
- Manufactures (TS) 134
- Handicrafts and Arts & Crafts (TT) 194
- Home economics (TX) 458