 |
| pistons: 86 phrases in 17 subjects |
| Agriculture | 4 |
| Antennas and waveguides | 4 |
| Chemistry | 9 |
| Construction | 1 |
| Earth sciences | 3 |
| Electronics | 2 |
| Energy industry | 2 |
| General | 2 |
| Hobbies and pastimes | 1 |
| Industry | 3 |
| Mechanic engineering | 40 |
| Medical | 2 |
| Metallurgy | 3 |
| Patents | 1 |
| Pest control | 2 |
| Textile industry | 1 |
| Transport | 6 |