{HEAD ~ A chair} is coupled to the shaft by {TAIL ~ a chair coupling member}; a device carriage is coupled to the shaft by a carriage coupling member; and a footrest assembly is coupled to the shaft by a footrest coupling member 
is coupled by
{ HEAD ~ A chair } is coupled to the shaft by { TAIL ~ a chair coupling member } ; a device carriage is coupled to the shaft by a carriage coupling member ; and a footrest assembly is coupled to the shaft by a footrest coupling member
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH