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

 - 1st 
 -  RB,Banglore  1970 
<br/><br/> Manual Telephony 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone Electronics 
<br/><br/><label>Dewey Class. No.: </label>