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