001: 2657
003: Starlibrary PMS 4.5
005: 20180420
020: ^a0-07-213188-8
066: ^are.V
072: ^athe history of telecommunications
082: ^a621
100: ^aregis
240: ^aVoice and data communications hand book
245: ^aVoice and data communications hand book
260: ^c2001
650: ^athe telephone network
650: ^athe telephone set
650: ^avoice characteristics