Helfrick, Albert D. <br/><br/>
Practical repair and maintenance of communications equipment / 
Albert D. Helfrick. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  c1983. 
 - xii, 308 p. :  ill. 
<br/><br/><label>ISBN: </label>0136935567 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio--Repairing.