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كفاءة : 38 phrases in 11 subjects |
| Accumulators | 2 |
| Antennas and waveguides | 9 |
| Automatic control | 1 |
| Electric traction | 2 |
| Environment | 1 |
| Lighting other than cinema | 3 |
| Mathematics | 6 |
| Sound recording | 4 |
| Telegraphy | 1 |
| Thermal Energy | 3 |
| Vacuum tubes | 6 |
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