Spangenberg, Karl R. <br/><br/>
Vacuum tubes 
Karl R. Spangenberg 
 -  c.1948 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vacuum-tubes--MScom
<br/><br/><label>Dewey Class. No.: </label>621.384132 SPA