File:WoodDrillPatent.png

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English: The rock drill patented by De Volson Wood
Date
Source De Volson Wood "Rock-drill" US patent 319653 Issue date: Jun 9, 1885
Author De Volson Wood
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current10:40, 15 November 2011Thumbnail for version as of 10:40, 15 November 20111,856 × 2,784 (140 KB)Materialscientist (talk | contribs){{Information |Description ={{en|1=The rock drill patented by De Volson Wood}} |Source =De Volson Wood "Rock-drill" US patent 319653 Issue date: Jun 9, 1885 |Author =De Volson Wood |Date =1885 |Permission = |other_versions

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