US Patent: 56,734
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Recutting File Blanks
Improved Mode of Repairing Files
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Patentee:
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| A. A. Dunk (exact or similar names) - Manchester, NH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jul. 31, 1866 |
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Joel Havens
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Description: |
| Munn & Co.- patent attorneys
The process of sharpening and renewing files, substantially as above described, by covering the tops of the teeth only with a protecting-coating, and then immersing the file in acid until the intervals are sufficiently deepened. |
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