| All Patents in class 91/321 |
Patents 1 -
6
of 6
      |
| 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 |
