TY  - BOOK
AU  - Biswas,Nripendra Nath
TI  - Principles of telephony
SN  - 818527309X
U1  - 621.385 BIS 
PY  - 1988/// [reprinted 2000]
CY  - India
PB  - Radiant Books
KW  - Telephone, Automatic
N1  - Includes index
ER  -