{TAIL ~ The conductive film} 9 functions as a switch for controlling the amount of {HEAD ~ electrons} emitted from the field emission tip 6 
{ TAIL ~ The conductive film } 9 functions as a switch for controlling the amount of { HEAD ~ electrons } emitted from the field emission tip 6
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH