File:WoodDrillPatent.png

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:40, 15 November 2011		1,856 × 2,784 (140 KB)	commons>Materialscientist	{{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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