Helfand, Lewis <br/><br/>
They changed the world  Edison-Tesla-Bell 

 - 5th 
 - New Delhi  Kalyani Navyug Media Pvt. Ltd.   2019 
 - 98p. 
<br/><br/><label>ISBN: </label>9789380741871 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventors<br/>United States
<br/><br/><label>Dewey Class. No.: </label>621.3  / HEL