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utile |
użyteczny : 31 phrases in 12 subjects |
Accumulators | 2 |
Economy | 1 |
Electricity generation | 3 |
Electronics | 2 |
Energy industry | 1 |
Lighting other than cinema | 1 |
Radio | 8 |
Radiology | 1 |
Satellite communications | 1 |
Telegraphy | 1 |
Thermal Energy | 4 |
Vacuum tubes | 6 |