#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
  supertype:  surveying_instrument__surveyinginstrument__surveyor's_instrument  an instrument used by surveyors
  subtype:  Abney_level  Dumpy_level
  part:  spirit_level__level  indicator that establishes the horizontal when a bubble is centered in a tube of liquid

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