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| All Patents in class 91/321 | |||||
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| Number | Date | Patentee | Title | Type | |
| 245,777 | Aug. 16, 1881 | B. Brazelle | Steam pumping-engine | steam pumping engines | |
| 434,561 | Aug. 19, 1890 | D.D. Hardy | Steam Engine | steam engines | |
| 626,497 | Jun. 06, 1899 | E.C. Meissner | Pneumatic Hammer | handheld power hammers | |
| 1,244,664 | Oct. 30, 1917 | H.E. Warren | Fluid-operated lathe | metal lathes | |
| 3,232,176 | Feb. 01, 1966 | L.A. Wagnon, R.E. Shulters, L. Kramer, J.C. Hearning | Percussion tool | ||
| 3,464,315 | Sep. 02, 1969 | H.A. Weyer | Mechanical pneumatic servo control system for high-speed impact devices | drop hammers | |