00726nam0-22002651i-450-990000974080403321000097408FED01000097408(Aleph)000097408FED0100009740820000920d1961----km-y0itay50------baengPhysics and Techniques of Electron TubesR. ChampeixOxford [etc.]Pergamon Press1961Fisica elettronica537.5Champeix,R.26631ITUNINARICAUNIMARCBK99000097408040332131A-0092266FI1FI1Physics and Techniques of Electron Tubes352982UNINAING01