TY  - BOOK
AU  - Das P.N.
TI  - Introduction to Automatic Telephony
SN  - 0000024145
U1  - 621.385 
PY  - 1963///
CY  - Calcutta
PB  - Modern Book Agency, Calcutta.
KW  -  Introduction
KW  -  Manual
KW  -  Telephony
KW  - Automatic
KW  - Telephony(621.385)
ER  -