| US Patent: 623,361 
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| Oscillating Gas or Steam Engine | 
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| Patentee: |  |
 | James H. Frew (exact or similar names) - New Castle, Lawrence County, PA |  
 
| USPTO Classifications: |  | 123/18A, 123/18R, 123/195HC, 123/197.1, 123/223, 123/65B, 123/70R, 123/70V, 29/888, 74/160, 92/120, 92/138, 92/144 |  
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Oct. 02, 1897 |  
| Granted: | Apr. 18, 1899 |  USPTO (New site tip)
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                        Joel Havens
 
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| Description: |  | Claim:
his invention relates to certain new and useful improvements in gas-engines, and has for its object to improve the construction of such engines so as to render the same more efficient and certain in their operation. |  |