{HEAD ~ The belt portion} 10 is provided with a series of cogs 12 on the rear side along {TAIL ~ the longitudinal direction} 
{ HEAD ~ The belt portion } 10 is provided with a series of cogs 12 on the rear side along { TAIL ~ the longitudinal direction }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL