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