00326nam a2200133Ia 4500008004100000020001500041041001200056082001100068100001700079245004500096260003500141300000800176650000800184221030s9999    xx            000 0 und d  a818527309X  aEnglish  a105.23  aN. N. Biswas 0aPrinciples of Telephonycby N. N. Biswas  bRadiant BooksaBangalorec1994  a138  aECE