{TAIL ~ The process} 6, wherein {HEAD ~ the angle} of movement about the pivot is about 60° 
{ TAIL ~ The process } 6 , wherein { HEAD ~ the angle } of movement about the pivot is about 60 °
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH