| US Patent: 594,399 
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| Wrench | 
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| Patentee: |  |
 | John A. Hill (exact or similar names) - Leechburg, PA |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Feb. 16, 1897 |  
| Granted: | Nov. 30, 1897 |  
 
USPTO (New site tip)| Patent Pictures: |  |  |  | John A. Hill patent November 30, 1897 |  Google Patents
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                        Stan Schulz
 
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| Description: |  | A swinging rack bar attached to the fixed jaw of the monkey wrench engages rack teeth on the movable jaw to hold the adjustment.  A notched rotating collar on the handle ferule serves to latch the rack bar in place. |  |