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الرنين : 22 phrases in 9 subjects |
| Antennas and waveguides | 1 |
| Electricity generation | 3 |
| Electronics | 1 |
| Lighting other than cinema | 1 |
| Magnetics | 2 |
| Microsoft | 3 |
| Piezoelectric crystals | 9 |
| Radiobiology | 1 |
| Rail transport | 1 |
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