00305nam a2200133Ia 45000030006000000080041000060400015000471000018000622450030000802500010001102600022001205460012001420050017001540STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aEveritt, W.L.  aCommunication engineering  aThird  bMcgraw hillc1956  aEnglish20220125170202.0