| 445 | Garbage disposal plants, incinerators |
| 481 | Drilling equipment |
| 577 | Central heating systems w/radiators |
| 58 | Sanitary syst. w/discharges, accommodation drain systems |
| 581 | Sanitary supply systems |
| 61 | Steam machinery for propulsion |
| 64 | Boilers, steam, gas generators |
| 641 | Main boilers |
| 644 | Auxiliary boilers |
| 646 | Exhaust gas boilers |
| 703 | Fuel oil supply systems |
| 841 | Heating oil treatment systems |