A number of runs of completed insulating glass components in queue to be assembled into insulating glass units at the assembly station is monitored to identify {HEAD ~ a low queue condition} of {TAIL ~ a given type} of insulating glass component 
A number of runs of completed insulating glass components in queue to be assembled into insulating glass units at the assembly station is monitored to identify { HEAD ~ a low queue condition } of { TAIL ~ a given type } of insulating glass component
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 HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH