| US Patent: 557,311 
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| Wrench | 
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| Patentee: |  |
 | Henry J. Martin (exact or similar names) - Chicago, IL |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Dec. 20, 1895 |  
| Granted: | Mar. 31, 1896 |  
 
USPTO (New site tip)| Patent Pictures: |  |  |  | Henry J. Martin patent March 31, 1896 |  Google Patents
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                        Stan Schulz
 
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| Description: |  | Worm and rack adjustable pocket wrench with the worm engaging teeth cut in opposite sides of a slot running up the mid-line of the handle. 
The specifications detail how the parts are assembled in the movable jaw of this design.
Cited as a reference in patent no. 2,444,135. |  |