000 00274nam a2200121Ia 4500
100 _aDAS P N
365 _cRS
365 _d1
942 _cENGBK
245 _aAn Introduction to Manual Digital Telephony
260 _bModern Book Agency
_c1990
_aCalcutta
300 _aIII+150 PP
999 _c4871
_d4871