 |
| acoustic filter: 23 phrases in 8 subjects |
| Automated equipment | 2 |
| Electronics | 7 |
| General | 3 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 1 |
| Security systems | 1 |
| Technology | 5 |
| Telecommunications | 3 |
|
| acoustic filter: 23 phrases in 8 subjects |
| Automated equipment | 2 |
| Electronics | 7 |
| General | 3 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 1 |
| Security systems | 1 |
| Technology | 5 |
| Telecommunications | 3 |