The shuttle element may serve as an indicator or signaling element, either alone or together with the above described functions, so as to signal to a sensor that {HEAD ~ the transition} or boundary between the paint and the auxiliary medium has reached {TAIL ~ a certain sensing location} 
The shuttle element may serve as an indicator or signaling element , either alone or together with the above described functions , so as to signal to a sensor that { HEAD ~ the transition } or boundary between the paint and the auxiliary medium has reached { TAIL ~ a certain sensing location }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL