{TAIL ~ This motion} is driven by {HEAD ~ connecting links} coupled to the movable parallelogram linkage 
{ TAIL ~ This motion } is driven by { HEAD ~ connecting links } coupled to the movable parallelogram linkage
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH