TY  - BOOK
AU  - Das,P.N.
TI  - An introduction to manual telephony: for the undergraduate students of telecommunication and electrical engineering
U1  - 621.3854 
PY  - 1967///
CY  - Calcutta
PB  - Modern Book
KW  - Telephone
KW  - Telephone system
KW  - Signalling
KW  - Telephone lines
N1  - Includes index
ER  -