| US Patent: 527,600 
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| Door-Lock-Marking Gage | 
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| Patentee: |  |
 | Frank K. Etherington (exact or similar names) - Cambridge, MA |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Nov. 20, 1893 |  
| Granted: | Oct. 16, 1894 |  USPTO (New site tip)
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                        Ralph Brendler
 
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| Description: |  | A butt gage that marks not only the position of the mortise for a door lock, 
    but also the location of the knob hole. |  |