| US Patent: 718,573 
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| Work-holding chuck | 
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| Patentees: |  
 | George de Laval (exact or similar names) - Cambridge, MA |  | Charles W. Chisholm (exact or similar names) - Somerville, MA |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | May 02, 1901 |  
| Granted: | Jan. 13, 1903 |  USPTO (New site tip)
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                        Carl Matthews
 
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| Description: |  | The assignee, George F. Blake Manufacturing Co., made pumps for steam engines, fire engines, and marine use. |  |