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| All Patents in class 418/66 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,927 | Dec. 04, 1849 | A. Stiven | Improvement in pumps for raising water | rotary pumps | |
| 448,607 | Mar. 17, 1891 | E.H. Gollings | Rotary Engine | rotary steam engines | |
| 455,863 | Jul. 14, 1891 | A. Cleland | Rotary Engine | rotary steam engines | |