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| akustisches Signal | |||
| akustische Signalisierung | |||
| akustische Signal | |||
| Schallzeichen n | |||
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segnale acustico : 35 phrases in 5 subjects |
| Communications | 6 |
| Earth sciences | 1 |
| Electronics | 2 |
| Health care | 3 |
| Information technology | 23 |
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