US Patent: 202,477
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| Improvement in wood-boring machines
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Patentee:
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| Thomas O. Selfridge (exact or similar names) - Washington, DC |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 30, 1878 |
| Granted: |
Apr. 16, 1878 |
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Patent Pictures:
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Selfridge 202,477 |
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George Langford
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Description: |
| In shape this is a breast drill with a twist. The object of the invention is to cut around the bolts holding decking on a ship. This would allow quicker replacement of the plank. Selfridge, a member of the Navy, shows 4 different cutters to do the job. |
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