File:IMG0004 drill bit.jpg

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Hughes and Sharp patent the first Roller Cone Drill Bit.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:16, 1 April 2015		1,825 × 2,332 (389 KB)	Aesdorn (talk \| contribs)	Hughes and Sharp patent the first Roller Cone Drill Bit.

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Date metadata was last modified	15:56, 30 October 2013