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impact sprinkler
An impact sprinkler (sometimes called an impulse sprinkler) is a type of irrigation sprinkler in which the sprinkler head, driven in a circular motion by the force of the outgoing water, pivots on a bearing on top of its threaded attachment nut. Invented in 1933 by Orton Englehardt, it quickly found widespread use. Though it has in many situations been replaced by gear-driven "rotor heads", many varieties of impact sprinkler remain in use.
== Development ==
The original horizontal action impact drive sprinkler was invented by a Glendora, California citrus grower, Orton Englehardt in 1933 and patented in 1935 (US Patent #1,997,901). Orton later sold it to Clem and Mary LaFetra who manufactured and marketed it under the brand name Rain Bird.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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