US Patent: 202,457
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| Device For Extracting Keys
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Patentee:
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| Paul A. Oliver (exact or similar names) - Wilkes-Barre, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 19, 1878 |
| Granted: |
Apr. 16, 1878 |
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Patent Pictures:
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Paul A. Oliver patent April 16, 1878 |
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Stan Schulz
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Description: |
| The patent is for a square key with an enlarged threaded boss and a corresponding nut. The auxiliary wrench needed to run the nut down far enough to start the key is shown in the drawing and identified in the specifications. |
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