000 00343nam a2200157Ia 4500
008 190201s9999 xx 000 0 und d
020 _a9.78E+12
082 _a621
082 _b387 AL
100 _a"Ali,Syed,Riffat"
245 0 _aDigital Switching System
260 _aNew Delhi
260 _bTMH
260 _c1998
300 _a"xv,219"
999 _c47858
_d47858