Biswas,Nripendra N <br/><br/>
Principles of telephony 

 - NewDelhi  UBS  1998 
 - 138p. 
<br/><br/><label>ISBN: </label>81-85273-09-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>telephony
<br/><br/><label>Dewey Class. No.: </label>621.395  / BIS 
<br/><br/><label>Universal Decimal Class. No.: </label>621.395 BIS