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1820 "Experimenta circa effectum conflictus electrici in acum magneticum". Hans Christian Oersted --- 21 June 1820 Death of Alexis Thérèse Petit 20 August 1820, Death of Andrew Ellicott in West Point, New York, USA 1820 Birth of John Tyndall 1820 Birth of Jean-Charles-Hippolyte-Joseph Houzeau de Lehaie
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