| All Patents in class 418/238 |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 141,710 | Aug. 12, 1873 | S. Gibson | Rotary Steam Engine | rotary steam engines |
| 260,513 | Jul. 04, 1882 | W.H. Wigmore | Gas Motor Engine | gas and gasoline engines |
| 314,389 | Mar. 24, 1885 | J.L. Mitchell | Rotary Engine | rotary steam engines |
| 459,381 | Sep. 08, 1891 | J.M. Stocker | Rotary Engine | rotary steam engines |
| 968,268 | Aug. 23, 1910 | A.C. Savidge | Rotary Engine | rotary steam engines |
| 1,819,689 | Aug. 18, 1931 | P.O. Ott | Hydraulic Pump | hydraulic pumps |
| 2,612,115 | Sep. 30, 1952 | W. Ernst | Vane Pump and Vane Therefor | hydraulic apparatus |
| 3,097,571 | Jul. 16, 1963 | F.A. Kaman | Motor for pneumatic drill | handheld power drills |
