The use of electricity in operation of audio and visual aids equipme nt / 
Kenneth Bale 
 - London :  O.V.A.C.,  1966. 
 - 24 p. 
 - Overseas Visual Aids Centre Publication ;  no. 15 .
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual equipment.
<br/><br/><label>Dewey Class. No.: </label>371.33