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