{HEAD ~ A frame support structure} having {TAIL ~ four frame engaging members} is automatically displaced to a frame receiving position 
having
{ HEAD ~ A frame support structure } having { TAIL ~ four frame engaging members } is automatically displaced to a frame receiving position
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH