| 109 | Maintenance systems, instruction material |
| 601 | Diesel engines |
| 641 | Main boilers |
| 651 | Motor aggregates |
| 74 | Exhaust systems, air intakes |
| 743 | Exhaust gas systems for propulsion machinery |
| 744 | Exhaust gas systems for motor aggregates |
| 745 | Exhaust gas systems for boilers |