#waterline__water_line__waterline__water_level  a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship
  supertype:  #line.location  a spatial location defined by a real or imaginary unidimensional extent
  subtype:  #load_line__Plimsoll_line__Plimsoll_mark__Plimsoll  waterlines to show the level the water should reach when the ship is properly loaded

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