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John Whitehurst is widely credited as the inventor who discovered the non-self-acting ram pump. John made his discovery in England in 1772. A second inventor called Montgolfier discovered the hydraulic valve system. This discovery completed the evolution of hydraulic pumps. This technology in part led to the development and manufacturing of hydraulic motors. The first American patent for hydraulic pumps was issued to the J. Cemeau and SS Hallet in New York City in the year 1809.