TY  - BOOK
AU  - Biswas N.N.
TI  - Principles of Telephony
SN  - 0000013374
U1  - 621.385 
PY  - 1970///
CY  - Bangalore
PB  - Radiant Books , Bangalore.
KW  - Electronics & Communication Engineering
KW  - Principles  Telephony
ER  -