| US Patent: 823,748 
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| Clamp | 
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| Patentee: |  |
 | Frederick E. Walden (exact or similar names) - Worcester, MA |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | Aug. 26, 1905 |  
| Granted: | Jun. 19, 1906 |  
 
USPTO (New site tip)| Patent Pictures:
	      
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			1 | 2
	        ] |  |  |  |  |  Google Patents
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                        Russ Allen
 
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| Description: |  | One of these appeared in a Martin J. Donnelly auction.  The screw can be set to travel freely by depressing the thumb latch. |  |