a frangible element disposed between said blade hammer and said blade support when {HEAD ~ said blade} is in the folded condition and engageable by {TAIL ~ said blade hammer} to dampen erection of said blade 
is engageable by
a frangible element disposed between said blade hammer and said blade support when { HEAD ~ said blade } is in the folded condition and engageable by { TAIL ~ said blade hammer } to dampen erection of said blade
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH