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| Fernerkundung der Ionosphäre | |||
| Ionosphärenecholotung f | |||
| Echolotung der Ionosphäre | |||
| Ionosphärenlotung f | |||
| sondage ionosphérique: 12 phrases in 3 subjects |
| Communications | 5 |
| Measuring instruments | 2 |
| Radio | 5 |
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