| All Patents in class 418/173 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
| | 38,542 | May 19, 1863 | W.B. Allyn | Rotary Steam Engine |
| | 449,325 | Mar. 31, 1891 | W.J. Kendig | Rotary Engine |
| | 455,028 | Jun. 30, 1891 | G. Westinghouse, Jr. | Rotary Engine |
 | 917,944 | Apr. 13, 1909 | B.F. Hoffman | Rotary Engine |
 | 990,163 | Apr. 18, 1911 | J.W. von Pittler | Rotary engine |
 | 1,819,689 | Aug. 18, 1931 | P.O. Ott | Hydraulic Pump |
 | 1,965,388 | Jul. 03, 1934 | P.O. Ott | Rotary Pump |
 | 1,988,213 | Jan. 15, 1935 | P.O. Ott | Multiple Rotary Pump |
 | 2,035,465 | Mar. 31, 1936 | W. Reinhardt, M.E. Erskine | Hydraulic Pump |
| | 3,011,449 | Dec. 05, 1961 | W. Ernst | Vaned Hydraulic Unit |
