| All Patents in class 417/521 |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 7,548X | Apr. 20, 1833 | T.P. Codman | Propelling machinery by combining air, animal, and water power | |
| 8,351X | Aug. 09, 1834 | T.A. Chandler | Engine for elevating and throwing water | water wheels |
| FX-9,221 | Oct. 31, 1835 | J. Redelsperger | Pump | pumps |
| 805,000 | Nov. 21, 1905 | W.E. Blair | Driving Mechanism for two Pump-Plungers | fuel pumps |
| 1,991,340 | Feb. 12, 1935 | A. Von Wangenheim | Pumping Means | oil pumps |
| 2,010,377 | Aug. 06, 1935 | B. Sassen | Hydraulic Power Unit | hydraulic apparatus |
| 2,138,194 | Nov. 29, 1938 | E.M. Pfauser | Hydraulic Pump | hydraulic pumps |
| 2,368,187 | Jan. 30, 1945 | L.E. Williams | Pump | |
