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| frequency spectrum in telecommunication | |||
| widmo częstotliwości: 3 phrases in 3 subjects |
| Communications | 1 |
| Construction | 1 |
| Radio | 1 |
|
| |||
| frequency spectrum in telecommunication | |||
| widmo częstotliwości: 3 phrases in 3 subjects |
| Communications | 1 |
| Construction | 1 |
| Radio | 1 |