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| All Patents in class 91/493 | |||||
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| Number | Date | Patentee | Title | Type | |
| 313,728 | Mar. 10, 1885 | D.D. Hardy | Steam Engine | steam engines | |
| 313,730 | Mar. 10, 1885 | D.D. Hardy | Multiple Cylinder Engine | steam engine cylinders | |
| 440,145 | Nov. 11, 1890 | J.M. Farmer | Rotary Engine | rotary steam engines | |
| 664,801 | Dec. 25, 1900 | W.D. Williams | Rotary Engine | rotary steam engines | |