US Patent: 247,669
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| Screwdriver
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Patentees:
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| Charles H. Mallett (exact or similar names) - Augusta, ME |
| Zachary T. Furbish (exact or similar names) - Augusta, ME |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 05, 1881 |
| Granted: |
Sep. 27, 1881 |
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Steve Gosselin
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Description: |
| Double locking feature between the handle and the tool with simplified construction. |
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