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| useful systems (ssn) | |||
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| useful system (ssn) | |||
| полезные системы: 70 phrases in 11 subjects |
| Agrochemistry | 1 |
| Astronautics | 10 |
| Economy | 1 |
| Hydraulic engineering | 1 |
| Makarov | 8 |
| Maritime law & Law of the Sea | 1 |
| Mass media | 2 |
| Military | 17 |
| Programming | 6 |
| Space | 1 |
| Technology | 22 |