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The hydraulic ram has been used to pump water from streams since the late 1770s when the first generation ram was invented in England by John Whitehurst. A few years later the pump was improved by the French, when a value was added that automated the action. In the U.S. the hydraulic ram built by S.S. Hallet and J. Cerneau was patented around 1809.

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12y ago

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