| US Patent: 18,521 
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| Device for reversing the chisel in mortising-machines | 
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| Patentee: |  |
 | Caleb B. Rogers (exact or similar names) - Norwich, CT |  
 
 
 
 
 
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| Patent Dates: |  
| Granted: | Oct. 27, 1857 |  USPTO (New site tip)
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                        Jeff Joslin
 Vintage Machinery entry for C. B. Rogers & Co.
 
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| Description: |  | "My improvement consists in the peculiar construction and application of a spiral way or guide, acting on a reversing check pin, to reverse the position of the chisel or mortising tool, for cutting opposite ends of the mortise." |  |