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| All Patents in class 91/8 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 309,278 | Dec. 16, 1884 | C.C. Worthington | Duplex compound engine | ||
 | 475,427 | May 24, 1892 | E.J. Woolf | Single Cylinder Compound Engine | |
 | 521,278 | Jun. 12, 1894 | E.J. Woolf | Engine | |
| 538,694 | May 07, 1895 | F.W. Ofeldt | Vapor Engine | ||
| 654,759 | Jul. 31, 1900 | J.B. O'Donnell | Duplex Steam Engine | ||
| 680,510 | Aug. 13, 1901 | E.C. Warren | Rotary Engine | ||