| 411 | Radar plants |
| 412 | Decca, loran, omega, radio direction finder |
| 421 | Radio plant, gmdss |
| 422 | Lifeboat radio transmitters, epirbs |
| 423 | Data transmission plants, communication |
| 424 | Vhf/uhf telephones |
| 546 | Hobby, sports and entertainment equipment |
| 70 | Fuel systems |