00353nam a2200145Ia 4500008004100000020001800041082002000059100002400079245001800103250000600121260004100127300000800168650001400176650001700190140316s9999    xx            000 0 und d  a81 237 1754 7  a621.382bMOH/TE  aMohan sundara Rajan  aTelecom story  a3  aNew DelhibNational Book Trustc1996  a187  aswitching  aTransmission