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| All Patents in class 91/53 | |||||
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| Number | Date | Patentee | Title | Type | |
| 293,762 | Feb. 19, 1884 | H.S. Maxim | Gas Motor | gas and gasoline engines | |
| 909,216 | Jan. 12, 1909 | W.D. Pomeroy | Means for Starting Dynamo Machines | synchronous motors | |