| US Patent: 658,540 
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| Rotary Nut | 
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| Patentees: |  
 | Frederich Wilhelm Bühne (exact or similar names) - Freiburg, Baden-Württemberg, Germany |  | August Ritz (exact or similar names) - St. Georgen, Schwarzwald-Baar County, Baden-Württemberg, Germany |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Jun. 12, 1900 |  
| Granted: | Sep. 25, 1900 |  USPTO (New site tip)
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                        Joel Havens
 
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