Spangenberg, Karl R. <br/><br/>
Vacuum tubes. 

 - 1st ed. 
 - New York,  McGraw-Hill Book Co.,  1948. 
 - xvii, 860 p.  illus., diagrs.  24 cm. 
 - McGraw-Hill electrical and electronic engineering series .
<br/><br/><label>LCCN: </label>48001249  
<br/><br/><label>Subjects--Topical Terms: </label><br/>TUBOS AL VACÍO
<br/><br/><label>Dewey Class. No.: </label>621.384132