TY  - BOOK
AU  - Das,P.N.
TI  - An introduction to automatic telephony: for the undergraduate students of tele communication and electrical engineering
U1  - 621.3877 
PY  - 1963///
CY  - Calcutta
PB  - Modern Book
KW  - Telephone, Dial
KW  - Telephone, Automatic
KW  - Telephone relays
KW  - Telephone switching systems, electronic
KW  - Telephone stations
N1  - Includes index; Includes bibliography: p. 207-208
ER  -