#spirit_level__level  indicator that establishes the horizontal when a bubble is centered in a tube of liquid
  supertype:  #indicator  a device for showing the operating condition of some system
  subtype:  #mason's_level  a level longer than a carpenter's level
  part of:  #carpenter's_level__carpenter'slevel  a straight bar of light metal with a spirit level in it
  part of:  #surveyor's_level  surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis; for measuring relative heights of land

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