000 00350nam a2200169Ia 4500
008 240220s9999 xx 000 0 und d
041 _aENG
100 _aBiswas N. N.
245 0 _aPrinciples of telephony
260 _aNULL
260 _bRadiant Books
260 _c1992
300 _a138p.
365 _b25
650 _aETC
942 _cDBK
999 _c20915
_d20915