 |
|
circulation control : 56 phrases in 18 subjects |
| Aerohydrodynamics | 7 |
| Armored vehicles | 2 |
| Aviation | 9 |
| Finances | 2 |
| General | 4 |
| Health care | 1 |
| Jewelry | 1 |
| Librarianship | 1 |
| Military | 6 |
| Nanotechnology | 1 |
| Oil / petroleum | 8 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |
| Oilfields | 1 |
| Refrigeration | 2 |
| Securities | 1 |
| Space | 4 |
| Technology | 4 |