 |
| audible warning: 16 phrases in 12 subjects |
| Astronautics | 1 |
| Automated equipment | 2 |
| Aviation | 1 |
| British usage, not spelling | 1 |
| Construction | 2 |
| Electronics | 1 |
| Energy industry | 1 |
| Military | 1 |
| Natural resourses and wildlife conservation | 1 |
| Occupational health & safety | 1 |
| Refrigeration | 1 |
| Technology | 3 |