The arm rotates about axis A with an angular range of rotation of {HEAD ~ the order} of {TAIL ~ 60 degrees} 
of
The arm rotates about axis A with an angular range of rotation of { HEAD ~ the order } of { TAIL ~ 60 degrees }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL