 |
|
warning device : 67 phrases in 16 subjects |
| Automated equipment | 4 |
| Automobiles | 3 |
| Communications | 4 |
| Construction | 1 |
| Electronics | 1 |
| General | 2 |
| Immigration and citizenship | 1 |
| Life sciences | 1 |
| Medical appliances | 2 |
| Military | 1 |
| Natural resourses and wildlife conservation | 2 |
| Natural sciences | 1 |
| Rail transport | 1 |
| Sewage and wastewater treatment | 1 |
| Technology | 6 |
| Transport | 36 |