#flexible_joint__hinge  a joint that holds two parts together so that one can swing relative to the other
  supertype:  #joint  junction by which parts or objects are joined together
  subtype:  #butt_hinge  #strap_hinge  #tee_hinge
  part of:  #bi-fold_door  #car_door  #exterior_door  #French_door  #gate  #swing_door
  part:  #pintle  a pin or bolt forming the pivot of a hinge

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