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| All Patents in class 91/239 | |||||
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| Number | Date | Patentee | Title | Type | |
| 676,848 | Jun. 18, 1901 | C.S. Prescott | Steam-engine valve | steam engine valves | |
| 836,778 | Nov. 27, 1906 | A.J. Patch | Pneumatic Hammer | pneumatic tools | |
| 1,106,338 | Aug. 04, 1914 | R.C. Stevens | Steam Engine | steam engines | |
| 1,132,226 | Mar. 16, 1915 | R.C. Stevens | Steam Engine | steam engines | |
| 1,696,868 | Dec. 25, 1928 | A.D. Skinner | Valve | steam engine valves | |
| 3,464,315 | Sep. 02, 1969 | H.A. Weyer | Mechanical pneumatic servo control system for high-speed impact devices | drop hammers | |