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| Patents for Louis J. Hirt | |||||
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| Number | Date | Patentee | Title | Type | |
| 620,926 | Mar. 14, 1899 | L.J. Hirt | Gas Engine | gas and gasoline engines | |
| 629,904 | Aug. 01, 1899 | L.J. Hirt | Gas Engine | gas and gasoline engines | |