US Patent: 375,155
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| Wrench
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Patentee:
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| John M. Haynes (exact or similar names) - Maxwell, CA |
| USPTO Classifications: |
| 81/69 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 16, 1887 |
| Granted: |
Dec. 20, 1887 |
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Patent Pictures:
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John M. Haynes patent December 20, 1887 |
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Stan Schulz
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Description: |
| The toothed jaw is hinged, and the grip tightens when the wrench moves in the direction indicated.
Ken Cope's "American Wrench Makers 1830-1930" implies the wrench was produced based on an 1888 SCIENTIFIC AMERICAN notice of the patent. |
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