File:AmCyc Boring - drill bit - twisted gimlet.jpg
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AmCyc_Boring_-_drill_bit_-_twisted_gimlet.jpg (60 × 568 pixels, file size: 12 KB, MIME type: image/jpeg)
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DescriptionAmCyc Boring - drill bit - twisted gimlet.jpg |
English: Woodcut/drawing of a drill bit for wood in the form of a screw: the twisted gimlet, made of a conical shaft, around which is cut a half-round spiral groove |
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Date | published 1879 | |||||||
Source | The American Cyclopædia, v. 3, 1879, p. 99 (Fig. 13). | |||||||
Author | Unknown authorUnknown author | |||||||
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current | 17:27, 25 March 2014 | 60 × 568 (12 KB) | Library Guy (talk | contribs) | {{Information |Description ={{en|1=Woodcut/drawing of a drill bit for wood in the form of a screw: the twisted gimlet, made of a conical shaft, around which is cut a half-round spiral groove}} |Source =''The American Cyclopædia'', v. 3, 187... |
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