Wherein {HEAD ~ the interlinked linkage} is configured by a pair of primary struts, and {TAIL ~ a pair} of secondary bars pivotally interlinked with pinshafts at ends of the struts and the bars 
is configured by
Wherein { HEAD ~ the interlinked linkage } is configured by a pair of primary struts , and { TAIL ~ a pair } of secondary bars pivotally interlinked with pinshafts at ends of the struts and the bars
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH