| US Patent: 173,439 
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| Improvement in cutter-heads for planing-machines | 
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| Patentee: |  |
 | Edwin Benjamin (exact or similar names) - Chicago, IL |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Mar. 18, 1875 |  
| Granted: | Feb. 15, 1876 |  
 
USPTO (New site tip)| Patent Pictures:
	      
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                        Jeff Joslin
 
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| Description: |  | Concave caps with dovetail fastenings for holding the knives to the head. The design is an improvement on the inventor's patent 142,669. |  |