a sensing edge, said leading edge and said sensing edge extending between the concave and convex {HEAD ~ edges} of {TAIL ~ one end} of the material layer, 
of
a sensing edge , said leading edge and said sensing edge extending between the concave and convex { HEAD ~ edges } of { TAIL ~ one end } of the material layer ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH