Scroggie, M. G.  <br/><br/>
Foundations of  Wireless. 

 - 7a ed., reimp 
 - London :   Iliffe,   1958. 
 - p. 388 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ELECTROTECNIA<br/>RADIO
<br/><br/><label>Universal Decimal Class. No.: </label>621.396