File:AmCyc Boring - drill bit - centre bit.jpg
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AmCyc_Boring_-_drill_bit_-_centre_bit.jpg (163 × 433 pixels, file size: 20 KB, MIME type: image/jpeg)
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DescriptionAmCyc Boring - drill bit - centre bit.jpg |
English: Woodcut/drawing of a drill bit for wood, the centre bit, an instrument of English invention, consists of a centre point, a shearing point, and a broad inclined cutter. |
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Date | published 1879 | |||||||
Source | The American Cyclopædia, v. 3, 1879, p. 99 (Fig. 11). | |||||||
Author | Unknown authorUnknown author | |||||||
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current | 17:11, 25 March 2014 | ![]() | 163 × 433 (20 KB) | Library Guy (talk | contribs) | {{Information |Description ={{en|1=Woodcut/drawing of a drill bit for wood, the centre bit, an instrument of English invention, consists of a centre point, a shearing point, and a broad inclined cutter.}} |Source =''The American Cyclopædia'... |
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