The collapsible position occupies less volumetric weight as compared to the fully extended position so as to reduce the volumetric weight when {HEAD ~ the backframe} is in transportation and {TAIL ~ storage} 
is in
The collapsible position occupies less volumetric weight as compared to the fully extended position so as to reduce the volumetric weight when { HEAD ~ the backframe } is in transportation and { TAIL ~ storage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL