File:AmCyc Boring - Drill with prolonged cutting edge tapered to a point (2).jpg
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AmCyc_Boring_-_Drill_with_prolonged_cutting_edge_tapered_to_a_point_(2).jpg (196 × 329 pixels, file size: 20 KB, MIME type: image/jpeg)
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DescriptionAmCyc Boring - Drill with prolonged cutting edge tapered to a point (2).jpg |
English: Woodcut/drawing of a drill bit with a prolonged cutting edge (ensuring a clean cut) tapered to a point (ensuring a straight hole). |
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Date | published 1879 | |||
Source | The American Cyclopædia, v. 3, 1879, p. 98 (Fig. 4). | |||
Author | Unknown authorUnknown author | |||
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current | 21:41, 20 March 2014 | ![]() | 196 × 329 (20 KB) | Library Guy (talk | contribs) | {{Information |Description ={{en|1=Woodcut/drawing of a drill bit with a prolonged cutting edge (ensuring a clean cut) tapered to a point (ensuring a straight hole).}} |Source =''The American Cyclopædia'', v. 3, 1879, p. 98 (Fig. 4). |Autho... |
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