US Patent: 191,010
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| Improvement in Wrenches
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Patentee:
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| Joseph P. Mitchell (exact or similar names) - New Bedford, MA |
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Patent Dates:
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| Applied: |
Jun. 15, 1875 |
| Granted: |
May 22, 1877 |
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Patent Pictures:
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1 | 2
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Joseph P. Mitchell patent May 22, 1877 , with 12 inch example courtesy Martin Donnelly mjdtools.com |
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Stan Schulz
Bowker & Tripp Mitchell's Patent (FLICKR)
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Description: |
| The central screw is both handle and adjustment means. A parallel rod keeps the jaws aligned. Contemporary hardware trade listings identify the manufacturer; the wrench is marked only with the patent date. Nine and twelve inch examples and a couple of minor style variants are known; it may have been made in other sizes as well. |
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