The thickness of the bladder is gradually decreased from the portions of the bladder, which correspond to the beads of the still unvulcanized tire, to {TAIL ~ the portion} of {HEAD ~ the bladder}, which corresponds to the tread of the still unvulcanized tire 
The thickness of the bladder is gradually decreased from the portions of the bladder , which correspond to the beads of the still unvulcanized tire , to { TAIL ~ the portion } of { HEAD ~ the bladder } , which corresponds to the tread of the still unvulcanized tire
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 TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH