 |
| worm wheel: 53 phrases in 18 subjects |
| Armored vehicles | 3 |
| Astronomy | 2 |
| Automated equipment | 4 |
| Automobiles | 8 |
| Chemistry | 1 |
| Construction | 3 |
| Gear train | 4 |
| General | 2 |
| Mechanic engineering | 6 |
| Mechanics | 2 |
| Military | 1 |
| Mining | 1 |
| Oilfields | 1 |
| Shipbuilding | 1 |
| Technology | 6 |
| Textile industry | 2 |
| Thermal engineering | 1 |
| Transport | 5 |