US Patent: 112,143
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| Improvement in Screw Drivers
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Patentee:
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| Henry L. Hildreth (exact or similar names) - Lockport, NY |
| USPTO Classifications: |
| 81/33 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Feb. 28, 1871 |
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Steve Gosselin
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Description: |
| Ratchet mechanism is provided by an external pawl that engages the collar securing the blade.
Hildreth's patent was later referenced in several later ratching screwdriver designs. |
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