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