Thus, {TAIL ~ the present invention} can be implemented with {HEAD ~ either a compression spring} or a tension spring 
Thus , { TAIL ~ the present invention } can be implemented with { HEAD ~ either a compression spring } or a tension spring
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH