| US Patent: 112,780 
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| Improvement in Combined Gauges and Try Squares | 
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| Patentee: |  |
 | Frederic Castle (exact or similar names) - Montana, IA |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Granted: | Mar. 21, 1871 |  
| Antedated: | Mar. 18, 1871 |  USPTO (New site tip)
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                        Ralph Brendler
 
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| Description: |  | This is a combination clapboard marker and try square, with an interesting
    cam-actuated locking mechanism and pistol grip handle. |  |