000 00290nam a2200109Ia 4500
008 230411s9999 xx 000 0 und d
082 _a621.3851
_bLAI
100 _aLaino (Jane)
245 0 _aTelecom Handbook understanding Telephone Systems & Services
260 _bOUP
_aNEW YORK
942 _cBK
999 _c3578
_d3578