"Klaproth, Martin Heinrich"@en . . . . . "German chemist" . "Martin Heinrich Klaproth"@en . . . "Martin Heinrich Klaproth (1 December 1743 \u2013 1 January 1817) was a German chemist who discovered uranium (1789), zirconium (1789), and cerium (1803)."@en . . "1743Z"^^ . . "1817Z"^^ . . "1743-12-01Z"^^ . "1817-01-01Z"^^ . . .