US Patent: 31,576
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| Improved Screw-Wrench
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Patentee:
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| William Mason (exact or similar names) - Warren, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Feb. 26, 1861 |
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Patent Pictures:
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William Mason patent Febr. 26, 1861 |
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Stan Schulz
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Description: |
| The wrench bar has threads cut on one face. The internally threaded adjusting ring, which is held in contact with the wrench bar by a spring, can be disengaged from the threads to make the jaw quickly adjusted. The description also notes calibration marks on the shank. |
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