| US Patent: 56,731 
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| Improvement in Wrenches | 
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| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | May 02, 1866 |  
| Granted: | Jul. 31, 1866 |  
 
USPTO (New site tip)| Patent Pictures: |  |  |  | J. F. Dodge Pat. July 31, 1866 |  Google Patents
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                        Stan Schulz
 
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| Description: |  | The double-faced jaws of this "ordinary screw wrench" have provisions for square and hex nuts as well as the usual hammer poll. |  |