00938nam a2200277 i 450099100132123970753620020507114419.0960521s1948 us ||| | eng b10204349-39ule_instLE00645821ExLDip.to Fisicaita621.3.2621.384132TK7872.V3Spangenberg, Karl R.2699Vacuum tubes /Karl R. SpangenbergNew York :McGraw-Hill Book Co. ; Tokyo : Kogakusha Company,1948xvii, 860 p. :ill. ;24 cm.Includes bibliographies.Vacuum-tubes.b1020434921-09-0627-06-02991001321239707536LE006 621.3.2 SPA12006000055307le006-E0.00-l- 00000.i1025241127-06-02Vacuum tubes192225UNISALENTOle00601-01-96ma -engus 01