31. It is equipped with a hydraulic pump used to raise water from the water table nearby. 32. Shortly before World War II, General Motors developed a central hydraulic pump for working convertible tops. 33. By the end of this year, all Sea Knights are expected to have new hydraulic pumps . 34. Hydraulic piston vangs are used on larger sailboats and controlled by manual or electric hydraulic pumps . 35. Nowadays, power blocks are usually driven by hydraulic pumps powered by the main or auxiliary engine. 36. The pneumatic pump powers the hydraulic pump by means of element coupling between the pump shafts. 37. One or more hydraulic pumps , coupled to one or more hydraulic motors, constitute a hydraulic transmission. 38. In 1870 a hydraulic pump house was built by Thomas Howard to power the bridges and machinery. 39. Hydraulic pressure was provided by three hydraulic pumps fitted to Nos . 1, 2 and 3 engines. 40. LaJoie could trigger it from the driver's seat with a lever that led to a hydraulic pump .
