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| All Patents in class 91/188 | |||||
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| Number | Date | Patentee | Title | Type | |
| 21,789 | Oct. 12, 1858 | W. Wells | Reciprocating Steam Engine | steam engines | |
| 103,212 | May 17, 1870 | H.E. Long | Rotary Steam Engine | steam engines | |
| 407,184 | Jul. 16, 1889 | J.H. Eickershoff | Single Acting Compound Engine | compound steam engines | |