P. N. Das <br/><br/>
An Introduction to Automatic Telephony 
by P. N. Das 
 - Calcutta  Modern Book  1993 
 - 272 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECE
<br/><br/><label>Dewey Class. No.: </label>105.23  / Das