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| back flow valve (AD Alexander Demidov) | |||
| затвор обратный: 21 phrases in 14 subjects |
| Automated equipment | 2 |
| Caspian | 1 |
| Electronics | 1 |
| Gas processing plants | 1 |
| General | 2 |
| Mechanic engineering | 1 |
| Microelectronics | 1 |
| Military | 1 |
| Mining | 2 |
| Oil and gas | 1 |
| Sakhalin | 1 |
| Semiconductors | 1 |
| Technology | 5 |
| Transport | 1 |