| US Patent: 247,669 
 | 
| Screwdriver | 
| 
| Patentees: |  
 | Charles H. Mallett (exact or similar names) - Augusta, ME |  | Zachary T. Furbish (exact or similar names) - Augusta, ME |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
 | 
| Patent Dates: |  
| Applied: | Aug. 05, 1881 |  
| Granted: | Sep. 27, 1881 |  USPTO (New site tip)
 Google Patents
 Report data errors or omissions to steward 
                        Steve Gosselin
 
 | 
| 
| Description: |  | Double locking feature between the handle and the tool with simplified construction. |  |