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due : 15 phrases in 9 subjects |
| Electricity generation | 1 |
| Electronics | 5 |
| Magnetics | 1 |
| Microsoft | 3 |
| Piezoelectric crystals | 1 |
| Radio | 1 |
| Telecommunications | 1 |
| Telegraphy | 1 |
| Vacuum tubes | 1 |
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