Das, P.N. <br/><br/>
An introduction to automatic telephony:  for the undergraduate students of tele communication and electrical engineering/ 
P.N. Das 
 - Calcutta:  Modern Book,  1963 
 - 212 p.;  22 cm. 
<br/><br/> Includes index 
<br/><br/>Includes bibliography: p. 207-208 
<br/><br/><label>ISBN: </label> Rs. 9.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone, Dial<br/>Telephone, Automatic<br/>Telephone relays<br/>Telephone switching systems, electronic<br/>Telephone stations
<br/><br/><label>Dewey Class. No.: </label>621.3877