US Patent: 216,516
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| Monkey-Wrench
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Patentee:
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| William M. Green (exact or similar names) - Stevens Point, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 28, 1879 |
| Granted: |
Jun. 17, 1879 |
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Patent Pictures:
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William M. Green patent June 17. 1879 |
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Stan Schulz
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Description: |
| The adjusting screw turns on a threaded shaft, and has external threads that engage threads inside the movable jaw. One set is left-hand threaded; the other set right-hand threaded. As a result this would be "double-speed" adjustment. |
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