US Patent: 446,592
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| Pipe Wrench
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Patentees:
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| Thomas Jefferson Duncan (exact or similar names) - Leadville, CO |
| Dennis McManus (exact or similar names) - Leadville, CO |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 01, 1890 |
| Granted: |
Feb. 17, 1891 |
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Patent Pictures:
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Thomas Jefferson Duncan and Dennis McManus patent February 17, 1891 |
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Stan Schulz
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Description: |
| A rocking link that connects the fixed and movable jaws has an internal spur that engages rack teeth cut in one face of the slot in the movable jaw. |
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