The control of {HEAD ~ the switch position} may be manual or may be controlled by {TAIL ~ a central processing unit} 10 
The control of { HEAD ~ the switch position } may be manual or may be controlled by { TAIL ~ a central processing unit } 10
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH