Industrial control Electronics : Devices, Systems,and applications 
Bartelt, Terry. 
 - Third edition. 
 -  Thomson Delmar Learning.  2006 
 - 616 pages. 
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<br/><br/><label>ISBN: </label>1-40186292-6 
<br/><br/><label>Dewey Class. No.: </label>629.89 B26i 2006