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| All Patents in class 123/44E | |||||
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| Number | Date | Patentee | Title | Type | |
| 137,261 | Mar. 25, 1873 | H. Taylor | Rotary Steam Engines | rotary steam engines | |
| 592,073 | Oct. 19, 1897 | P. Auriol | Gas Engine | gas and gasoline engines | |