| US Patent: 156,989 
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| Improvement in Saw Grinding Machines | 
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| Patentee: |  |
 | Henry Disston (exact or similar names) - Philadelphia, PA |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Aug. 07, 1874 |  
| Granted: | Nov. 17, 1874 |  
 
USPTO (New site tip)| Patent Pictures:
	      
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                        Russ Allen.
 
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| Description: |  | Circular saw grinding machine with a rotating table for the blade with two grindstones on opposite sides of the center of the blade.  Grindstones can be angled. |  |