At the upper position, the tabletop units 32 are separated and the brace portions 38 and 40 are disposed in substantially axial alignment or in {TAIL ~ substantially a straight line}, and the tabletop units 32 are at {HEAD ~ higher tabletop position} 
At the upper position , the tabletop units 32 are separated and the brace portions 38 and 40 are disposed in substantially axial alignment or in { TAIL ~ substantially a straight line } , and the tabletop units 32 are at { HEAD ~ higher tabletop position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD