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スペクトル : 69 phrases in 13 subjects |
| Antennas and waveguides | 8 |
| Electronics | 20 |
| Lighting other than cinema | 9 |
| Mathematics | 1 |
| Microsoft | 2 |
| Nuclear physics | 4 |
| Piezoelectric crystals | 1 |
| Power lines | 1 |
| Radio | 10 |
| Radiology | 3 |
| Satellite communications | 5 |
| Telephony | 4 |
| Vacuum tubes | 1 |
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