Cachet depicts Otto Hahn's equipment and the nuclear fission of uranium atoms. Stamp shows Hahn's diagram of the splitting of the uranium nucleus. Hahn was the Nobel Prize Winner for Chemistry in 1944.
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“First Day Cover Commemorating Otto Hahn's 1944 Nobel Prize in Chemistry.” Germany, 1979. Witco Stamp Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/xp68kg42c.
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