#oar  an implement used to propel or steer a boat
  supertype:  #implement  instrumentation (a piece of equipment or tool) used to effect an end
  subtype:  #boat_paddle  #short-handled_scull  #long-handled_scull  #sweep_oar
  part:  #blade.rotating_mechanism__vane  flat surface that rotates and pushes against air or water

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