 |
| valve rod: 77 phrases in 17 subjects |
| Armored vehicles | 8 |
| Artillery | 1 |
| Automobiles | 5 |
| Aviation | 1 |
| General | 1 |
| Mechanic engineering | 12 |
| Metallurgy | 2 |
| Mining | 1 |
| Nautical | 2 |
| Oil and gas | 2 |
| Oil and gas technology | 1 |
| Oilfields | 1 |
| Rail transport | 6 |
| Shipbuilding | 3 |
| Technology | 21 |
| Thermal engineering | 1 |
| Transport | 9 |