A tool T having a hook portion formed on an upper end of {TAIL ~ the tool T} is provided for pulling the central hanger 21 downwardly when {HEAD ~ the patient} sits on the chair 5 
A tool T having a hook portion formed on an upper end of { TAIL ~ the tool T } is provided for pulling the central hanger 21 downwardly when { HEAD ~ the patient } sits on the chair 5
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH