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| All Patents in class 418/40 | |||||
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| Number | Date | Patentee | Title | Type | |
| 501,224 | Jul. 11, 1893 | J.H. Eickershoff | Engine | steam engines | |
| 855,028 | May 28, 1907 | J.C. Walker | Rotary Engine | rotary steam engines | |