 |
| frequency control: 49 phrases in 17 subjects |
| Agriculture | 1 |
| Automated equipment | 3 |
| Communications | 4 |
| Electricity generation | 1 |
| Electronics | 20 |
| Finances | 2 |
| General | 7 |
| Health care | 1 |
| High energy physics | 1 |
| Industry | 1 |
| Measuring instruments | 2 |
| Mechanic engineering | 1 |
| Patents | 1 |
| Radio | 1 |
| Telecommunications | 1 |
| Textile industry | 1 |
| Transport | 1 |