US Patent: 55,895
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| Improvement in drill-couplings
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Patentees:
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| Edward E. Packer (exact or similar names) - Philadelphia, PA |
| Charles T. Packer (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jun. 26, 1866 |
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Jeff Joslin
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Description: |
| Spring-key especially intended for holding drill rods in well drilling. This patent is mainly notable for being an early patent for a shaft key. |
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