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| All Patents in class 91/11 | |||||
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| Number | Date | Patentee | Title | Type | |
| 641,762 | Jan. 23, 1900 | H.C. Clay | Compound Engine | compound steam engines | |
| 741,743 | Oct. 20, 1903 | C.E. Van Norman | Valve for compound engine | compound steam engines | |
| 798,848 | Sep. 05, 1905 | E.C. Warren | Rotary Engine | rotary steam engines | |