| 41 | Navigation, searching equipment |
| 42 | Communication equipment |
| 423 | Data transmission plants, communication |
| 66 | Other aggr., gen. for main, emergency el. power production |
| 79 | Automation systems for machinery |
| 811 | Fire detection, fire and lifeboat alarm systems |
| 85 | Common electric, electronic systems |
| 86 | Electric power supply |
| 87 | Common electric distribution systems |
| 88 | Electric cable installation |
| 89 | Electric consumer systems |