{HEAD ~ a frame} mounted to said {TAIL ~ housing} for vertical movements and located adjacent to said floor opening 
mounted to
{ HEAD ~ a frame } mounted to said { TAIL ~ housing } for vertical movements and located adjacent to said floor opening
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH