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