Biswas, Nripendra N <br/><br/>
Principles of Telephony 
Nripendra N Biswas 
 - India  Radiant Books  1993 
 - vii, 138p. 
<br/><br/><label>ISBN: </label>818527309x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone, Automatic
<br/><br/><label>Dewey Class. No.: </label>621.385 BIS