The field relates generally to the field of controls and, more particularly, to method and apparatus for controlling {TAIL ~ dispensers} and for detecting {HEAD ~ users} 
The field relates generally to the field of controls and , more particularly , to method and apparatus for controlling { TAIL ~ dispensers } and for detecting { HEAD ~ users }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD