DC motors speed controls servo systems  an engineering handbook 
Electro-Craft corporation                                    
 - Oxford  Pergamon Press  1977 
 - [various pagings.] 
<br/><br/><label>ISBN: </label>0-08-021715-X-F 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operating systems
<br/><br/><label>Universal Decimal Class. No.: </label>621.3(035)  / ECC