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In an earth boring drill, a cutter is disclosed with cutting teeth arranged to engage a selec 1973 United States Patent [191 Pessier ANTI-TRACKING EARTH BORING DRILL v [75

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United States Patent Primary Examiner-James A. Leppink Attorney-John S. O'Brien AB earth drilling tools, more particularly, to a drill bit suitable for use with rotary percussion d

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United States Patent 5647448 Abstract: A drill bit for placement on a trenchless drill, the 3. The drill bit of claim 1 wherein each of said teeth has a conical portion and a cylindrica

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United States Patent 9297251 Abstract: A drill bit includes a plurality of blades. The blades provide a plurality of cutting elements or teeth arranged on a leading face of the blade

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United States. It is bordered by 6 states; Texas on the south, New Mexico on the west, C and water. They provide evidence of some of the oldest fossils on earth. The oldest foss

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United States Patent 5213449 Abstract: Apparatus for inserting flexible drainage wick m earth, said drive means including a drive gear that has teeth positioned to engage said s

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US Patent # 6,561,291. Roller cone drill bit structure having improved

United States Patent 6,561,291 Xiang May 13, 2003 Roller cone drill bit structure havin This invention is related to the field of drill bits used to drill wellbores in the earth. More s

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United States Patent 8020639 Abstract: The blades of a PDC bit have a nozzle betwee 1. A drill bit for making a wellbore, comprising: a plurality of blades extending from a bod

US3743038 - Drill bit - Google

United States Patent 1191 [11] 3,743,038 Bennett July 3, 1973 [54] DRILL BIT 1,388,45 DRILL BIT BACKGROUND OF THE INVENTION This invention relates to a rotary earth

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