US Patent: 585,127
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| Explosive Gas Engine
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Patentees:
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| George W. Starr (exact or similar names) - Havana, Mason County, IL |
| John Henry Cogswell (exact or similar names) - Havana, Mason County, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 26, 1896 |
| Granted: |
Jun. 22, 1897 |
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Joel Havens
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