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| All Patents in class 91/233 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 106,078 | Aug. 02, 1870 | J. Robertson | Direct Acting Engine | ||
| 113,725 | Apr. 18, 1871 | W. Baxter, Jr. | Steam Pump | ||
 | 138,622 | May 06, 1873 | R. Eickemeyer | Improvement in steam-pumps | |
 | 155,933 | Oct. 13, 1874 | R. Eickemeyer | Improvement in steam-engines | |
| 315,516 | Apr. 14, 1885 | W.J. Lane | Steam Engine | ||
| 617,529 | Jan. 10, 1899 | A. Howard | Motive Engine | ||
 | 2,345,563 | Apr. 04, 1944 | R.L. Alcorn, Jr. | Hydraulically operated drop hammer | |