 |
| release valve: 83 phrases in 30 subjects |
| Aerohydrodynamics | 2 |
| Armored vehicles | 2 |
| Astronautics | 4 |
| Automated equipment | 1 |
| Automobiles | 4 |
| Construction | 5 |
| Drilling | 1 |
| Electrical engineering | 1 |
| Energy industry | 3 |
| Gas processing plants | 1 |
| Hydrography | 1 |
| Makarov | 3 |
| Mechanic engineering | 2 |
| Mechanics | 2 |
| Metallurgy | 1 |
| Military | 2 |
| Mining | 1 |
| Molikpaq | 1 |
| Nautical | 1 |
| Occupational health & safety | 1 |
| Oil / petroleum | 3 |
| Oil and gas | 3 |
| Oil and gas technology | 2 |
| Oilfields | 1 |
| Pipelines | 1 |
| Plastics | 1 |
| Rail transport | 2 |
| Refrigeration | 2 |
| Technology | 26 |
| Transport | 3 |