In this way, {HEAD ~ the bellows} covers the upper portion of {TAIL ~ the canvas belt} on the upper side 
In this way , { HEAD ~ the bellows } covers the upper portion of { TAIL ~ the canvas belt } on the upper side
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH