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spiral spring : 28 phrases in 15 subjects |
| Armored vehicles | 2 |
| Automated equipment | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| General | 1 |
| Machinery and mechanisms | 3 |
| Makarov | 1 |
| Mechanic engineering | 6 |
| Non-destructive testing | 2 |
| Oil / petroleum | 2 |
| Oil and gas technology | 1 |
| Shipbuilding | 1 |
| Technology | 3 |
| Textile industry | 2 |
| Transport | 1 |