000 00498nam a2200205Ia 4500
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020 _a471620564
100 _aBellamy, John
245 0 _aDigital telephony
250 _a2
260 _aNew York
260 _bJohn Wiley
260 _c1991
300 _axix, 572p. : ill. ;
500 _aIncludes biliographical references and index.
650 _aTelephone systems -- Digital
942 _cBK
999 _c22341
_d22341