US Patent: 361,522
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| Auger Bit
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Patentee:
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| Charles H. Irwin (exact or similar names) - Martinsville, OH |
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Patent Dates:
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| Applied: |
Jul. 17, 1886 |
| Granted: |
Apr. 19, 1887 |
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Russ Allen.
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Description: |
| Solid auger bit with a central stem and single knife edge cutter and concave upper or rear side blade. This patent references Dimitt's patent 306907 as similar but distinct due to the concave upper or rear side blade. Cited as an improvement over Dimitt's patent with both marked on Irwin Auger Bit drill bit boxes. |
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