00827nam0-22002891i-450-990000002280403321000000228FED01000000228(Aleph)000000228FED0100000022820011111d--------km-y0itay50------baitay-------001yyTraffic and trunking principles in automatic telephonyG. S. Berkeley.LondonE. Benn1934XI, 241 p.ill.22 cmTelefonia621.385Berkeley,Gordon Spence330967ITUNINARICAUNIMARCBK99000000228040332113 B 52 1110222FINBCFINBCTraffic and trunking principles in automatic telephony107627UNINAING01