US Patent: 315,530
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| Manufacture of Drills
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Patentee:
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| Samuel Moore (exact or similar names) - Providence, Providence County, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 23, 1885 |
| Granted: |
Apr. 14, 1885 |
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Joel Havens
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Description: |
| Claim:
In my invention, the cylindrical blank is rolled first between flat rolls to face it on two sides and bring it to uniform thickness. The fattened blank is then passed between rolls with slightly convex faces to start the groove therein and then rolls with more decided convex faces are used to complete the groove. |
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