| US Patent: 385,018 
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| Spring-hammer for blacksmiths | 
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| Patentees: |  
 | Henry Stewart (exact or similar names) - Longmont, CO |  | Wellington B. Wiswall (exact or similar names) - Longmont, CO |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Apr. 30, 1888 |  
| Granted: | Jun. 26, 1888 |  USPTO (New site tip)
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                        Jeff Joslin
 
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| Description: |  | "After the first two or three strokes of the hammer a man can, without lifting his foot from the floor, but by simply working his toes up and down as his heel rests on the floor, strike a tremendous blow, the springs by their rebound keeping the hammer in activity." |  |