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| All Patents in class 91/239 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 676,848 | Jun. 18, 1901 | C.S. Prescott | Steam-engine valve | |
| 836,778 | Nov. 27, 1906 | A.J. Patch | Pneumatic Hammer | ||
| 1,106,338 | Aug. 04, 1914 | R.C. Stevens | Steam Engine | ||
| 1,132,226 | Mar. 16, 1915 | R.C. Stevens | Steam Engine | ||
| 1,696,868 | Dec. 25, 1928 | A.D. Skinner | Valve | ||
 | 3,464,315 | Sep. 02, 1969 | H.A. Weyer | Mechanical pneumatic servo control system for high-speed impact devices | |
| 4,526,000 | Jul. 02, 1985 | A.C. Saurwein | Pressure Intensifier | ||