US Patent: 336,468
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| Pipe Wrench
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Patentees:
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| Christian Bonnichsen (exact or similar names) - Newburgh, NY |
| Michael R. Chrystal (exact or similar names) - Newburgh, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 29, 1885 |
| Granted: |
Feb. 16, 1886 |
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Patent Pictures:
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Christian Bonnichsen and Michael R. Chrystal patent February 16, 1886 |
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Stan Schulz
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Description: |
| The gripping portion is alternately a chain or semi-circular jaws. Either form is connected to the handle by a swinging link. |
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