US Patent: 195,877
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| Improvement in Countersinks
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Patentee:
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| Daniel F. Barber (exact or similar names) - Newton, MA |
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Patent Dates:
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| Applied: |
Apr. 12, 1877 |
| Granted: |
Oct. 09, 1877 |
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Patent Pictures:
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1 | 2
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Jeff Joslin
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Description: |
| Barber indicates his awareness of Pettes' patent 110494, but asserts his device is materially different due to the configuration of the orifice in which the drill bit is trapped. Specifically, the claim is that the angled sides accurately center bits of various sizes, relative to the location of the knife. |
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