FIG 15 is a perspective view of {HEAD ~ a series} of spring elements in {TAIL ~ a stacked arrangement} 
FIG 15 is a perspective view of { HEAD ~ a series } of spring elements in { TAIL ~ a stacked arrangement }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL