{HEAD ~ A portion} of the surface 37b and {TAIL ~ the beveled surface} at the converging end of the horse shoe, which is the cutting edge 37, has a layer of hardened material applied to improve the wear and self sharpening characteristics of the tooth 
{ HEAD ~ A portion } of the surface 37b and { TAIL ~ the beveled surface } at the converging end of the horse shoe , which is the cutting edge 37 , has a layer of hardened material applied to improve the wear and self sharpening characteristics of the tooth
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