| 1. Assembly Services |
| 2. Building, Civil Engineering Works and Consultancy Services |
| 3. Consulting Engineers or Designers |
| 4. Engineering Consultancy, Asset Management |
| 5. Engineering Services, Conceptual Design |
| 6. Engineering Technical Services |
| 7. Mechanical Contractors |
| 8. Mechanical Engineering Design |
| 9. Mechanical Engineering Support |
| 10. Mechanical Engineers or Engineering Contractors |