00858nam0-22003131i-450-99000048254040332120071217164455.0000048254FED01000048254(Aleph)000048254FED0100004825420020821d1968----km-y0itay50------baenga-------001yyIntroduction to telephony and telegraphyE. H. JolleyNew YorkHart Publishingc1968413 p.ill.28 cmtelefoniatelegrafia621.385621.383Jolley,Ernest Harris26320ITUNINARICAUNIMARCBK99000048254040332110 E II 299S.I.DINELDINELIntroduction to telephony and telegraphy332351UNINA