| US Patent: 157,134 
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| Improvement in sash-dovetailing machines | 
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| Patentees: |  
 | George Zimmer (exact or similar names) - Williamsport, PA |  | Oscar J. Pennell (exact or similar names) - Williamsport, PA |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | Apr. 04, 1874 |  
| Granted: | Nov. 24, 1874 |  USPTO (New site tip)
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                        Jeff Joslin
 Vintage Machinery entry for Rowley & Hermance Co.
 
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| Description: |  | This patent date was seen in an 1897 Rowley & Hermance catalog on a "Improved Sash Dovetailing Machine". |  |