US Patent: 538,841
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| Monkey Wrench
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Patentee:
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| Vincent J. McDonnell (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 13, 1895 |
| Granted: |
May 07, 1895 |
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Patent Pictures:
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Vincent J. McDonnell patent May 7, 1895 |
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Stan Schulz
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Description: |
| Quick-adjust nut wrench with final adjustment and position of movable jaw held by a "mutilated screw." The patent includes optional forms for the screw and an optional adjustment lock.
4th patent in an evolutionary sequence -- 402,265, 415,183 and 449,129 are earlier stages. |
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