Biswas N.N. <br/><br/>
Principles of Telephony 

 - Bangalore  Radiant Books , Bangalore.  1970 
<br/><br/><label>ISBN: </label>0000013374 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics & Communication Engineering<br/>Principles  Telephony
<br/><br/><label>Dewey Class. No.: </label>621.385