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Elektronenröhre f f =, -n
gen.	electron tube; electronic tube; gas tube; valve; thermionic tube
astr.	electronic valve (GB); electron tube (USA)
el.	electronic valve
phys.	electron valve; thermionic valve
tech.	radio tube; vacuum tube
Elektronenröhren f
gen.	electron tubes

Elektronenröhre: 3 phrases in 2 subjects

Antennas and waveguides	1
Electronics	2