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