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power signal box; power-operated signal box |
posto de potência : 50 phrases in 12 subjects |
Coal | 2 |
Communications | 3 |
Earth sciences | 5 |
Electricity generation | 1 |
Electronics | 20 |
Information technology | 2 |
Insurance | 1 |
Magnetics | 3 |
Municipal planning | 1 |
Nuclear physics | 3 |
Technology | 4 |
Transport | 5 |