US Patent: 12,318
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| Auger
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Patentee:
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| Russell Jennings (exact or similar names) - Deep River, CT |
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Patent Dates:
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| Granted: |
Jan. 30, 1855 |
| Reissue Information: |
| Reissued as RE2,081 (Oct. 03, 1865) |
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Russ Allen.
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Description: |
| Double twist auger bit with the cutting edges designed so that the vertical scores follow the chisel. This design is so that the cutting edges of scores and chisel never intersect the worm or helix of the shaft at the same point. |
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