| All Patents in class 91/239 |
Patents 1 -
7
of 7
      |
| 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 |
| 4,526,000 | Jul. 02, 1985 | A.C. Saurwein | Pressure Intensifier | water jet cutting apparatus |
