Cockrell, W.D. <br/><br/>
Industrial electronic control. A guide to the understanding of electronic control circuits for industrial uses 

 - New York:  McGraw-Hill  1950 
 - xv, 385p. :   il; 20 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrónica<br/>Electrónica