| Naics index | Naics index description |
|---|---|
| 541330 | Petroleum engineering services |
| 541330 | Robotics automation engineering services |
| 541330 | Robotics engineering design and integration services |
| 541330 | Traffic engineering consulting services |
| 541340 | Blueprint drafting services |
| 541340 | Computer-aided design drafting (CADD) services |
| 541340 | Drafting services |
| 541340 | Draftsmen's offices |
| 541350 | Building inspection bureaus |
| 541350 | Building inspection services |