HAPP, H. H. <br/><br/>
DIAKOPTICS AND NETWORKS 

 - S.E. 
 - S.L. Sin Pais  ACPR INC.  1971 
 - 312 
<br/><br/><label>LCCN: </label>9460 
<br/><br/><label>Dewey Class. No.: </label>621.3192