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Bench Mark

From Draftsperson.net

  • A marked reference point on a permanent object, such as a metal disk set in concrete, whose elevation is referenced to a datum is known.
  • A mark made by a surveyor or general contractor to be used as a reference point when measuring the elevation or location of other points.
  • A surveyor's mark, cut in rock, or other durable material, to indicate the starting or other point in a line of levels for the determination of altitudes over the face of a country.

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