US Patent: 407,868
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| Boring-Bit
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Patentee:
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| Joseph C. Middleton (exact or similar names) - Norristown, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 29, 1888 |
| Granted: |
Jul. 30, 1889 |
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Patent Pictures:
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1 | 2
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Jeff Joslin (dm)
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Description: |
| Concave semi-circular bit, which allows for the cutting edge to extend nearly to the tip. Similar idea to a gimlet bit patented by Benjamin Bee (172377), but differing by having a smooth lead and threaded body. |
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