The display bar has transparent and opaque portions, and as it slidably moves in relation to the display area, {HEAD ~ the transparent portions} of the display bar reveal {TAIL ~ a predetermined bedding control schedule} 
reveal
The display bar has transparent and opaque portions , and as it slidably moves in relation to the display area , { HEAD ~ the transparent portions } of the display bar reveal { TAIL ~ a predetermined bedding control schedule }
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 OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL