The knob 82 and dial 84 can be {TAIL ~ part} of {HEAD ~ an electronic device} 
The knob 82 and dial 84 can be { TAIL ~ part } of { HEAD ~ an electronic device }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD