00681nam0-22002531i-450-99000398084040332120031120114244.0000398084FED01000398084(Aleph)000398084FED0100039808420030922d--------km-y0itay50------baengPrinciples of Electron TubesReich H. J.1New YorkMcgraw-Hill book company1941Reich,H. J.383600ITUNINARICAUNIMARCBK99000398084040332100 P13152390DETECDETECPrinciples of Electron Tubes473706UNINA