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    • 1950 – 1969

    This photograph is part of a series of marketing images used to demonstrate the small size of Helipot products. The horizontal coil 6 cent postage stamp depicts Franklin Delano Roosevelt. This Prominent Americans Issue…

    • 1979

    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.

    • 1963-Nov-21

    Stamps depict Niels Bohr, the equation for the Bohr frequency condition (an equation relating to light frequency and electrons), and a diagram of the Bohr model of a hydrogen atom.

    • 1967

    Depicts Wilhelm Conrad Röntgen, awarded the first Nobel Prize in Physics for the discovery of X-rays, along with an X-ray tube and an atom.

    • 1975

    Stamp issued during International Women's Year (1975), depicting Marie Curie, "discoverer of radium," by the former British colony Saint Christopher-Nevis-Anguilla (now called the Federation of Saint Kitts and Nevis.)

    • 1934

    Stamp issued by the "Deutsche Reich" government under Nazi rule depicting images associated with the profession of chemistry.

    • 1956

    Stamp depicts aspects of chemistry and related sciences. The design depicting a laboratory vessel is illustrative of the scientific equipment used widely for research in the chemical industry. A representative chemical…

    • circa 1961

    Stamp from the inauguration of Democritus Nuclear Research Centre in Agia Paraskevi. Depicts ancient Greek philosopher Democritus and a model of an atom.

    • circa 1954

    Depicts a chemist with test tube and flask, as well as the chemical structure of a carboxyl group.