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In page John Ericsson:
"By 1833, Capt. Ericsson built his third engine,[4] a hot air engine (or caloric engine) that is exhibited in London: "the engine will prove the most important mechanical invention ever conceived by the human mind, and one that will confer greater benefits on civilized life than any that has ever preceded it" (John O. Sargent). This engine included a regenerator that would inspire many other hot air engine inventors.[citation needed]
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