US Patent: 291,267
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| Pipe Wrench
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Patentees:
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| Frank Armstrong (exact or similar names) - Bridgeport, CT |
| Nathaniel W. Vandegrift (exact or similar names) - Bridgeport, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 21, 1883 |
| Granted: |
Jan. 01, 1884 |
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Patent Pictures:
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Frank Armstrong and Nathaniel W. Vandegrift patent January 1, 1884 |
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Stan Schulz
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Description: |
| This patent shares an adjustable jaw and handle design with Armstrong and Vandegrift's parallel patent (no. 291,266). The internal linkage within the lower jaw differs.
The adjustable jaw and some aspects of the handle design carried over into the next patents (nos. 298,043 and 392,300) which were put into production. |
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