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

 -  Radiant. B'lore  1988 
 - 138 
<br/><br/> Content page available 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephony
<br/><br/><label>Dewey Class. No.: </label>621.385  BIS;15