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