| US Patent: 172,180 
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| Improvement in Plow-Clevis | 
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| Patentee: |  |
 | John Schofield (exact or similar names) - Moline, IL |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Nov. 06, 1875 |  
| Granted: | Jan. 11, 1876 |  
 
USPTO (New site tip)| Patent Pictures: |  |  |  | John Schofield Pat. January 11, 1876 |  Google Patents
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                        Stan Schulz
 
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| Description: |  | The wrench-headed pin in this patent is specifically mentioned in the text. |  |