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