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File:H Hughes Drill Patent 1908 Filing.jpg

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Hughes Two-Cone Drill Bit 1908 Patent Filing

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Description
English: Patent filing by Howard Hughes (1908) for a two-cone drill bit, used for oil well drilling
Date
Source US Patent Drawing
Author Howard Hughes

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:H_Hughes_Drill_Patent_1908_Filing.jpg

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current15:10, 21 October 2019Thumbnail for version as of 15:10, 21 October 2019511 × 843 (151 KB)TomahF (talk | contribs)User created page with UploadWizard

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