#paddle.blade  a blade of a paddle wheel or water wheel
  supertype:  #blade.rotating_mechanism__vane  flat surface that rotates and pushes against air or water
  part of:  #millwheel  water wheel that is used to drive machinery in a mill
     part of:  #water_mill__watermill  a mill powered by a water wheel
  part of:  #paddlewheel  a large wheel fitted with paddles and driven by an engine in order to propel a boat

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