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| German thesaurus | |||
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| Instrumentenflugregeln | |||
| Internationaler Förderkreis für Raumfahrt | |||
| Instrument Flight Rules | |||
| Instrumentenflugregeln | |||
| Installations-Fragen-Kommission | |||
| instrument(al) flight rules Instrumentenflugregeln | |||
| Blindflugregeln | |||
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| Institut für Regelungstechnik | |||
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IFR : 21 phrases in 5 subjects |
| Aviation | 2 |
| Communications | 1 |
| Life sciences | 1 |
| Technology | 10 |
| Transport | 7 |