00450nam a2200157Ia 4500003000900000008004100009040001600050080001700066100001800083245009900101250001200200260003500212300001000247650001600257650001900273IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a621.385bHAR  aHarvey, A. F. 0aHigh frequency thermionic tubescA. F. Harvey                                                   a2nd ed.  aLondonbChapman and Hallc1946  a235p.  aElectronics  aNASA Thesaurus