| US Patent: 745,758 
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| Slotting Machine Tool Holder | 
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| Patentees: |  
 | John Armstrong (exact or similar names) - Chicago, Cook County, IL |  | Samuel Welter (exact or similar names) - Chicago, Cook County, IL |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | May 29, 1903 |  
| Granted: | Dec. 01, 1903 |  USPTO (New site tip)
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                        Joel Havens
 Armstrong Brothers Tool Co. history
 "Vintage Machinery" entry for Armstrong Brothers Tool Co.
 
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| Description: |  | Louis K. Gillson - patent attorney |  |