| US Patent: 942,756 
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| Power Hammer | 
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| Patentees: |  
 | Thomas Scott-King (exact or similar names) - Penarth, Glamorgan County, Cardiff, Wales |  | William Norris (exact or similar names) - Blackpool, Lancashire County,  England |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Sep. 04, 1906 |  
| Granted: | Dec. 07, 1909 |  USPTO (New site tip)
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                        Joel Havens
 
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