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| inställningsbar frekvens; ställbar frekvens; variabel frekvens; varierbar frekvens | |||
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frequence variable : 8 phrases in 6 subjects |
| Communications | 2 |
| Electric motors | 1 |
| Electric traction | 1 |
| Electronics | 2 |
| Mechanic engineering | 1 |
| Power electronics | 1 |