Hallows, R. W <br/><br/>
Introduction to valves 
R. W. Hallows and H. K. Milward. 
 - London  Iliffe & Sons  1953 
 - 152p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NASA thesaurus<br/>Numotic circuits<br/>Valves
<br/><br/><label>Universal Decimal Class. No.: </label>621.385.1  / HAL