| US Patent: 4,990 
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| Improvement in Chisels | 
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| Patentees: |  
 | Reuben Fairchild (exact or similar names) - Trumbull, CT |  | Starr Fairchild (exact or similar names) - Trumbull, CT |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Granted: | Feb. 27, 1847 |  USPTO (New site tip)
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                        Russ Allen.
 
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| Description: |  | Uses a spring on the back of a chisel or between two chisels to aid in clearing chips. |  |