As will be discussed, these notches may be employed to cooperate with {HEAD ~ pins} or other retainers, to prevent relative rotation between the casing 75 and {TAIL ~ the segments} 
As will be discussed , these notches may be employed to cooperate with { HEAD ~ pins } or other retainers , to prevent relative rotation between the casing 75 and { TAIL ~ the segments }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL