US Patent: 583,741
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| Wrench
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Patentee:
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| Karl Gerhardt (exact or similar names) - Hartford, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 15, 1897 |
| Granted: |
Jun. 01, 1897 |
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Patent Pictures:
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Karl Gerhardt patent June 1, 1897 |
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Stan Schulz
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Description: |
| Self-adjusting nut wrench employing sliding jaws on opposite faces of a wedge-shaped opening. Springs act to return the jaws to "open" position when the closing pressure is released. |
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