| 31020 | Electronic components in general |
| 31040 | Resistors |
| 31060 | Capacitors |
| 31080 | Semiconductor devices |
| 31100 | Electronic tubes |
| 31120 | Electronic display devices |
| 31140 | Piezoelectric and dielectreic devices |
| 31160 | Electric filters |
| 31180 | Printed circuits and boards |
| 31190 | Electronic component assemblies |
| 31200 | Integrated circuits. Microelectronics |
| 31220 | Electromechanical components for electronic and telecommunications equipment |
| 31240 | Mechanical structures for electronic equipment |
| 31260 | Optoelectronics. Laser equipment |
