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إشارة : 411 phrases in 23 subjects |
| Automatic control | 20 |
| Cables and cable production | 3 |
| Electrical engineering | 2 |
| Electricity generation | 1 |
| Electronics | 54 |
| General | 2 |
| Lighting other than cinema | 13 |
| Magnetics | 1 |
| Mathematics | 1 |
| Microsoft | 16 |
| Piezoelectric crystals | 2 |
| Power lines | 55 |
| Power system protection | 12 |
| Radio | 55 |
| Radiobiology | 4 |
| Rail transport | 48 |
| Satellite communications | 1 |
| Sound recording | 6 |
| Telecommunications | 53 |
| Telegraphy | 56 |
| Telephony | 1 |
| Vacuum tubes | 1 |
| Video recording | 4 |
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