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

 - Bangalore  1970 
 - 130p 
<br/><br/><label>ISBN: </label>978-0210223123 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics
<br/><br/><label>Dewey Class. No.: </label>530.2 BISP