00519nam a2200181Ia 4500003000900000008004100009040001600050080001700066100002000083245009000103250001200193260004400205300001600249650001300265650002400278650001600302650001900318IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a621.385bWIL  aWilliams, Emrys 0aThermonic Valve CircuitscEmrys Williams                                               a2nd ed.  aLondonbSir Isaac Pitman and Sonsc1947  aviii, 207p.  aCircuits  aElectronic Circuits  aElectronics  aNASA Thesaurus