Das, P. N.
An introduction to Mannual telephony : for the undergraduate students of tele-communication and electrical engineering / P. N. Das - [2nd ed.] - Calcutta : Modern Book Agency, c1973. - viii, 212 p. : ill. ; 22 cm.
Includes index.
sa 64000289
Telephone, Automatic.
TK6397 / .D3
621.385 / DAI
An introduction to Mannual telephony : for the undergraduate students of tele-communication and electrical engineering / P. N. Das - [2nd ed.] - Calcutta : Modern Book Agency, c1973. - viii, 212 p. : ill. ; 22 cm.
Includes index.
sa 64000289
Telephone, Automatic.
TK6397 / .D3
621.385 / DAI