US Patent: 273,461
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Wrench
Improved Self-Adjusting Wrench
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Patentee:
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| Joseph Warren Calef (exact or similar names) - North Easton, MA |
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Patent Dates:
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| Applied: |
Feb. 03, 1883 |
| Granted: |
Mar. 06, 1883 |
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Patent Pictures:
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1 | 2
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Joseph W. Calef patent March 6, 1883 |
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Stan Schulz
Lowentraut SAMSON wrench (FLICKR)
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Description: |
| This improvement on Calef's April 13, 1880 patent (no. 226,490) changes the shape of the teeth on the handle and sliding jaw.
Both patents were used for the Lowentraut SAMSON self-adjusting wrench. |
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