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Netzfrequenz f
gen.	commercial frequency; power frequency; supply frequency
earth.sc., mech.eng.	frequency of the net; net frequency
meas.inst.	commercial-line frequency
opt.	power line frequency
phys.	power-line frequency; power supply frequency
tech.	line frequency; mains frequency; system frequency

Netzfrequenz: 2 phrases in 2 subjects

Electricity generation	1
Metallurgy	1