Penfold, R. A. <br/><br/>
Electronic security devices 

 - London  ; Bernard Babani  , 1990 
 - 102p. 
<br/><br/><label>ISBN: </label>0900162767  £2.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics<br/>Engineering
<br/><br/><label>Dewey Class. No.: </label>621.381  / PEN