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Eigenfrequenz f
gen.	.fréquence de libre course; fréquence de relaxation
commun.	ionosonde f; sondeur ionosphérique vertical; sondeur vertical
commun., el.	fréquence caractéristique
construct.	fréquence des oscillations libres
earth.sc.	fréquence naturelle; fréquence propre

Eigenfrequenz: 11 phrases in 4 subjects

Electronics	8
General	1
Measuring instruments	1
Transport	1