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| Patents for Percy MacCallum | |||||
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| Number | Date | Patentee | Title | Type | |
| 418,417 | Dec. 31, 1889 | L.H. Nash | Gas Engine | gas and gasoline engines | |
| 418,418 | Dec. 31, 1889 | L.H. Nash | Method of Operating Gas Engines | gas and gasoline engines | |
| 418,419 | Dec. 31, 1889 | L.H. Nash | Igniter for Gas Engines | ignition systems | |