US Patent: 502,997
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| Monkey Wrench
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Patentee:
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| Edwin Sylvester Pratt (exact or similar names) - Parry Sound, ON Canada |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 23, 1893 |
| Granted: |
Aug. 08, 1893 |
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Patent Pictures:
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Edwin S. Pratt patent August 8, 1893 |
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Stan Schulz
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Description: |
| The adjusting nut is mounted on a pivoting plate, so that it can be moved into and out of engagement with the rack threads on the main shank.
Canadian patent CA-43,855 issued August 7, 1893 and British patent GB-189313389 registered July 10, 1893 are parallel patents for the same design. |
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