| US Patent: 1,422,491 
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| Tool Holder | 
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| Patentee: |  |
 | Gustav H. Stahl (exact or similar names) - Menominee, Menominee County, WI |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Oct. 24, 1918 |  
| Granted: | Jul. 11, 1922 |  USPTO (New site tip)
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                        Joel Havens
 
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| Description: |  | Application renewed 12 Nov., 1921.
Progress Mfg. Co. was a partnership between Gustav H. Stahl and Richard Goerner. |  |