The bellows has undulations with ridges and valleys with ridge angles determined such that {TAIL ~ contact} between {HEAD ~ adjacent undulations} when the boot is operatively connected is confined to a plane 
The bellows has undulations with ridges and valleys with ridge angles determined such that { TAIL ~ contact } between { HEAD ~ adjacent undulations } when the boot is operatively connected is confined to a plane
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH