00829nam0-22002891i-450-99000049184040332120071025162812.0000049184FED01000049184(Aleph)000049184FED0100004918420020821d1920----km-y0itay50------baenga-------001yy<<The >>thermionic vacuum tube and its applicationsby H. J. Van Der BijlNew York ; LondonMcGraw-Hill1920391 p.ill.24 cmTelegrafo384.1Van der Bijl,H. J.491782ITUNINARICAUNIMARCBK99000049184040332110 E I 322220DINELDINELThermionic vacuum tube and its applications333012UNINA