Roller-Cone Drill Bit: Difference between revisions
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''This article is a stub, you can help by expanding it.'' | ''This article is a stub, you can help by expanding it.'' | ||
[[File:IMG0004_drill_bit.jpg|200px|thumb|left|First roller cone drill bit. Photo courtesy Baker Hughes.]] | |||
Hughes and Sharp patent the first roller-cone drill bit with two cones made of steel, 1909. | Hughes and Sharp patent the first roller-cone drill bit with two cones made of steel, 1909. | ||
[[Category:Energy]] | [[Category:Energy]] | ||
