The International Harvester Liftall was their early version of a hydraulic system for farm tractors. An amazingly robust system - Mr. Haney's works perfectly well after running for years with only a dried up scum oil for lubrication. It's not a "live" system; it only supplies pressure when the clutch is engaged. But it will work anything that has a hydraulic cylinder attached.
A couple of people, more familiar with modern hydraulic systems, have asked how the Liftall operated, so I copied these images from the IH Liftall Service Manual (CHS-68, Dated 6-1-47). They are diagrams of the Liftall pump and attached cylinders that show the system at various conditions.