OSRAM valve manual 

 - London  The General Electric Co.  1951 
 - (v.1-254 p.) 
<br/><br/> Contents: v.1-receiving types of valves cathode ray tubes electronic devices. 
<br/><br/><label>ISBN: </label>84299 
<br/><br/><label>Dewey Class. No.: </label>621.384  / OSR