US Patent: 451,792
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| Wrench
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Patentees:
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| Frederick M. Wirtz (exact or similar names) - Columbus, OH |
| John Wirtz (exact or similar names) - Columbus, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 03, 1890 |
| Granted: |
May 05, 1891 |
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Patent Pictures:
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Frederick M. Wirtz and John Wirtz patent May 5, 1891 |
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Stan Schulz
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Description: |
| Self-adjusting sliding jaw with gear teeth that mesh with gear teeth on the handle. |
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