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| All Patents in class 418/174 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 141,436 | Aug. 05, 1873 | D.D. Hardy | Rotary Steam-Engines | ||
| 445,038 | Jan. 20, 1891 | S.G. Brosius | Rotary Steam Engine | ||
| 445,039 | Jan. 20, 1891 | S.G. Brosius | Rotary Steam Engine | ||
| 463,267 | Nov. 17, 1891 | S.G. Brosius | Rotary Steam Engine | ||
 | 990,163 | Apr. 18, 1911 | J.W. von Pittler | Rotary engine | |