 |
|
Passive InfraRed : 58 phrases in 13 subjects |
| Air defense | 6 |
| Astronautics | 1 |
| Automated equipment | 2 |
| Jet engines | 4 |
| Mass media | 1 |
| Military | 13 |
| Mobile and cellular communications | 1 |
| Quantum electronics | 1 |
| Radioengineering | 8 |
| Security systems | 6 |
| Space | 5 |
| Technology | 9 |
| Telecommunications | 1 |