| B08 | Maintenance, spare parts and supplies |
| F02 | Air filters & spark arresters |
| F03 | Air & gas valves |
| G04 | Fluid filters |
| G05 | Fluid valves & other armatures |
| G06 | Purification plants & fluid treatment |
| H01 | Tanks |
| H04 | Cooling components for fluids |
| H06 | Preheaters |
| L01 | Sensors, gauges & detectors |
| L02 | Meters & indicators |
| L06 | Regulators & switches |
| L07 | Centrals, consoles & panels |
| L11 | Signal cables & connectors |
| P07 | Antennas & transmitters |