01169nam0 22003013i 450 AQ1000654720251003044041.0081860829320100804d1989 ||||0itac50 baengusz01i xxxe z01nDigital private branch exchanges (PBXs)tutorial[edited by] Edwin R. CooverWashington (D.C.)IEEE computer society pressc1989IX, 384 p.28 cm.Impianti telefoniciFIRCFIC017972I621.386APPARECCHIATURE TELEFONICHE TERMINALI14621.386INGEGNERIA DELLE COMUNICAZIONI. APPARECCHIATURE TELEFONICHE TERMINALI22Coover, Edwin R. <1942- >AQ1V003473ITIT-00000020100804IT-BN0095 NAP 01SALA DING $AQ10006547Biblioteca Centralizzata di Ateneo1 v.1 v. 01SALA DING 621.386 DIGPBE 0102 0000013555 VMA A4 1 v.Y 1994051919940519 01Digital private branch exchanges (PBXs)1571149UNISANNIO