Dictron,  <br/><br/>
Wireless Step By Step 

 - London  George Newnes Limited  1930 
 - 185p 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label> 0 
<br/><br/><label>Dewey Class. No.: </label>Q72  / D561