 |
| |||
| نافع | |||
| użyteczny: 28 phrases in 10 subjects |
| Accumulators | 2 |
| Electricity generation | 3 |
| Electronics | 1 |
| Lighting other than cinema | 2 |
| Radio | 7 |
| Radiology | 1 |
| Satellite communications | 1 |
| Telegraphy | 1 |
| Thermal Energy | 4 |
| Vacuum tubes | 6 |
|
| |||
| نافع | |||
| użyteczny: 28 phrases in 10 subjects |
| Accumulators | 2 |
| Electricity generation | 3 |
| Electronics | 1 |
| Lighting other than cinema | 2 |
| Radio | 7 |
| Radiology | 1 |
| Satellite communications | 1 |
| Telegraphy | 1 |
| Thermal Energy | 4 |
| Vacuum tubes | 6 |