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| Patents for John H. Hamilton | |||||
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| Number | Date | Patentee | Title | Type | |
| 621,525 | Mar. 21, 1899 | J.H. Hamilton | Gas or Vapor Engine | gas and gasoline engines | |
| 621,526 | Mar. 21, 1899 | J.H. Hamilton | Gas Motor Engine | gas and gasoline engines | |