| US Patent: 548,772 
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| Explosive Gas Engine | 
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| Patentee: |  |
 | John R. Bridges (exact or similar names) - Finlay, Hancock County, OH |  
 
| USPTO Classifications: |  | 123/193.1, 123/195R, 123/2, 123/25C, 123/41.67, 123/41.72, 123/556, 123/65VB, 123/65VC, 123/69V, 123/71V, 123/90.49, 123/90.5, 92/176 |  
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Apr. 28, 1893 |  
| Granted: | Oct. 29, 1895 |  USPTO (New site tip)
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                        Joel Havens
 
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