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

 - BANGALORE  Radiant Books  1993 
 - vii,138p.,21x14cm. 
<br/><br/><label>ISBN: </label>9788185273099 
<br/><br/><label>Dewey Class. No.: </label>621.385 B56P