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Schwingungsdauer f =
gen.	period; vibration period
astr.	time of oscillation; period of vibration
chem.	oscillation time period
meas.inst.	period (of oscillation)
met.	duration of oscillation
tech.	periodic time; oscillation period; period of oscillation

Schwingungsdauer: 2 phrases in 2 subjects

Electronics	1
Optics branch of physics	1