Image:Drill bit tricone worn.jpg

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Drill bit, oil, tricone, worn

Public domain This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy


source: http://quake.wr.usgs.gov/drillhole/photos/med-worn_drill_bit.html

Duk 06:26, 15 Feb 2005 (UTC)

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