| US Patent: 540,140 
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| Power Hammer | 
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| Patentees: |  
 | Royal B. Boynton (exact or similar names) - West Townsend, Middlesex County, MA |  | Daniel L. Chandler (exact or similar names) - Ayer, Middlesex County, MA |  | Frank E. Tenney (exact or similar names) - Ayer, Middlesex County, MA |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | May 18, 1894 |  
| Granted: | May 28, 1895 |  USPTO (New site tip)
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                        Joel Havens
 
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