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| audio frequency AF (NF); low frequency | |||
| audiofrequency | |||
| audible frequency; audible tone | |||
| Low Frequency | |||
| audio frequency (AF); voice frequency | |||
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| low-frequency | |||
| AF; AF -audio frequency; low frequency (30-3000 KHz) | |||
| a.f. | |||
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| low-frequency | |||
| Niemiecki tezaurus | |||
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| Nf | |||
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Niederfrequenz : 33 do fraz, 7 tematyki |
| Elektronika | 12 |
| Hutnictwo | 2 |
| Komunikacja | 3 |
| Medycyna | 1 |
| Pospolicie | 2 |
| Technika i technologia | 10 |
| Urządzenia medyczne | 3 |