KARL R SPANGENBERG <br/><br/>
VACUUM TUBES 

 - LONDON  MCGRAW HILL BOOK COMPANY  1948 
 -  860P 
<br/><br/><label>Subjects--Topical Terms: </label><br/><br/>
<br/><br/><label>Dewey Class. No.: </label>621.342/SPA C1