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protective relay : 41 phrases in 12 subjects |
| Automated equipment | 15 |
| Construction | 1 |
| Electrical engineering | 4 |
| Electronics | 2 |
| Energy industry | 1 |
| General | 1 |
| Mechanics | 1 |
| Occupational health & safety | 4 |
| Power system protection | 2 |
| Soviet | 1 |
| Space | 1 |
| Technology | 8 |