00474nam a2200181Ia 4500001000400000003000900004008004100013020000800054082001600062100001800078245002800096250000800124260005300132300001900185520002500204526004900229650001400278127BD-ChIIU150105s9999    xx            000 0 und d  aNil  a384.6/B621p  aBiswas, N. N.  aPrinciples Of Telephony  a1st  aNew DelhibUBS Publishers Distributors Ltdc1998  a138bYesc21cm  aTelephone, Principle  aDepartment of Computer Science & Engineering  aTelephone