File:PSM V21 D439 Rock fracture and excavation using tapered needle.jpg
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DescriptionPSM V21 D439 Rock fracture and excavation using tapered needle.jpg | Rock fracture and excavation using tapered needle | |||||
Date | ||||||
Source | Popular Science Monthly Volume 21 | |||||
Author | Unknown authorUnknown author | |||||
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current | 05:13, 26 August 2010 | 1,432 × 1,306 (320 KB) | Ineuw (talk | contribs) | {{Information |Description = Rock fracture and excavation using tapered needle |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_21.djvu/439 |Date = 1882 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[C |
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