{TAIL ~ An elongated means} under {HEAD ~ tension} is provided within the arms and about the joint members for maintaining the position of the head end in given angular position 
{ TAIL ~ An elongated means } under { HEAD ~ tension } is provided within the arms and about the joint members for maintaining the position of the head end in given angular position
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH