Rexford, Kenneth B. <br/><br/>
Electrical control for machines 
Kenneth B. Rexford 
 - 4th ed. 
 - Albany, N.Y.  Delmar Publishers Inc.  1992 
 - 455 p. : ill. ; 24 cm. 
<br/><br/>p. 430-445 
<br/><br/><label>ISBN: </label>0827348681  RM108.78 
<br/><br/><label>LCCN: </label>91-14664 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric controllers