Jozef Karol Hell
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Jozef Karol Hell (Slovak), Hell József Károly (Hungarian), Josef/ph Karl Hell (German) (1713-1789) was a mining engineer and inventor who, in 1755, invented the water-pillar, the world's first water pump machine. It is mainly used today for oil extraction. He also proposed construction of the tajchy reservoirs around Banská Štiavnica. He was a son of Maximilian Hell and a student of Samuel Mikoviny.