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| All Patents in class 91/25 | |||||
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| Number | Date | Patentee | Title | Type | |
| 155,933 | Oct. 13, 1874 | R. Eickemeyer | Improvement in steam-engines | steam engines | |
| 2,560,449 | Jul. 10, 1951 | V.R. Noll, M. Kahr | Free piston engine | ||
| 3,232,176 | Feb. 01, 1966 | L.A. Wagnon, R.E. Shulters, L. Kramer, J.C. Hearning | Percussion tool | ||