| US Patent: 646,397 
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| Grinding-Machine | 
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| Patentees: |  
 | John Sellers Bancroft (exact or similar names) - Philadelphia, PA |  | William H. Thorne (exact or similar names) - Philadelphia, PA |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | Oct. 23, 1896 |  
| Granted: | Mar. 27, 1900 |  USPTO (New site tip)
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                        Joel Havens
 "Vintage Machinery" entry for William Sellers & Co.
 
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| Description: |  | Co-inventor William H. Thorne co-founded The Atlantic Works, which became an important maker of woodworking machinery. |  |