{HEAD ~ The four bar linkage} is {TAIL ~ a parallelogram type linkage} which enables the jogger plate to maintain its orientation in space regardless of any swinging movement experienced by the parallelogram linkage 
is
{ HEAD ~ The four bar linkage } is { TAIL ~ a parallelogram type linkage } which enables the jogger plate to maintain its orientation in space regardless of any swinging movement experienced by the parallelogram linkage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH