TY  - BOOK
AU  - Jolley, E H
TI  - Introduction to telephony and telegraphy
SN  - 8185614369
CY  - Allahabad
KW  - Digital telephone signalling
KW  - Telegraphy
KW  - Telephone signalling codes -- Digital
KW  - Telephony
KW  - Traffic and Trunking -- Telephone traffic
N1  - Includes index
ER  -