US Patent: 557,311 
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| Wrench
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	        Patentee:
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 | Henry J. Martin (exact or similar names) - Chicago, IL |  
 
 
 
 
 
| Manufacturer: |  
| Not known to have been produced |  
 
 
 
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        Patent Dates:
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| Applied: | 
Dec. 20, 1895 | 
 
| Granted: | 
Mar. 31, 1896 | 
 
 
 
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		  Patent Pictures:
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Henry J. Martin patent March 31, 1896  |  
 
USPTO (New site tip) 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. |  
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