It is therefore {HEAD ~ an object} of {TAIL ~ this invention} to overcome the above mentioned drawbacks and to provide an improved rubber boot 
of
It is therefore { HEAD ~ an object } of { TAIL ~ this invention } to overcome the above mentioned drawbacks and to provide an improved rubber boot
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH