The middle section 48 includes {HEAD ~ a series} of {TAIL ~ notches} 56 and raised portions 58 of a type well known in the art 
of
The middle section 48 includes { HEAD ~ a series } of { TAIL ~ notches } 56 and raised portions 58 of a type well known in the art
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH