Graphic symbols for electrical and electronics diagrams (including reference designation letters)  
/ American National Standard 
 - USA:   American National Standard,   1975 
 - 111p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Universal Decimal Class. No.: </label>621.3.012(084)   / L5