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reversal phase voltage relay : 35 phrases in 12 subjects |
| Air defense | 1 |
| Construction | 1 |
| Electric machinery | 2 |
| Electronics | 9 |
| General | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Polymers | 1 |
| Space | 4 |
| Technology | 10 |
| Wind Energy | 1 |
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