| US Patent: 274,099 
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| Saw-mill dog | 
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| Patentees: |  
 | Frank M. Underwood (exact or similar names) - Columbus, OH |  | Ackber O. Mitchell (exact or similar names) - Columbus, OH |  | John Ackerman (exact or similar names) - Columbus, OH |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Jan. 20, 1883 |  
| Granted: | Mar. 20, 1883 |  USPTO (New site tip)
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                        Jeff Joslin
 
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