| All Patents in class 417/521 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
| | 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 |
 | FX-9,221 | Oct. 31, 1835 | J. Redelsperger | Pump |
 | 805,000 | Nov. 21, 1905 | W.E. Blair | Driving Mechanism for two Pump-Plungers |
| | 1,991,340 | Feb. 12, 1935 | A. Von Wangenheim | Pumping Means |
| | 2,010,377 | Aug. 06, 1935 | B. Sassen | Hydraulic Power Unit |
| | 2,138,194 | Nov. 29, 1938 | E.M. Pfauser | Hydraulic Pump |
| | 2,368,187 | Jan. 30, 1945 | L.E. Williams | Pump |
