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