| US Patent: 450,403 
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| Machine for Fitting the Exhaust Valve Boxes of Steam Engines | 
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| Patentees: |  
 | George H. Corliss, deceased (estate of) (exact or similar names) - Providence, RI |  | Emily A. Corliss, administratrix (exact or similar names) - Providence, RI |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Dec. 16, 1889 |  
| Granted: | Apr. 14, 1891 |  USPTO (New site tip)
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                        Joel Havens
 "Vintage Machinery" entry for Corliss Steam Engine Works
 
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| Description: |  | Application renewed 06 Nov., 1890. |  |