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File:H Hughes Drill Patent 1908 Filing.jpg

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Summary

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

Licensing

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.

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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

Captions

Hughes Two-Cone Drill Bit 1908 Patent Filing

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Date/TimeThumbnailDimensionsUserComment
current15:10, 21 October 2019Thumbnail for version as of 15:10, 21 October 2019511 × 843 (151 KB)TomahFUser created page with UploadWizard

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