#wheelchair  a movable chair mounted on large wheels; for invalids or those who cannot walk; frequently propelled by the occupant
  supertype:  #chair  a seat for one person, with a support for the back
  subtype:  #bath_chair  a wheelchair usually pushed by an attendant, as at a spa
  subtype:  #motorized_wheelchair__motorizedwheelchair  a wheelchair propelled by a motor

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