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Nobel Prize–winning German physicist (1858–1947) who pioneered the understanding of quantum theory. ALS in German, signed “Max u. Mayn Planck,” one page on a 5.5 x 3.5 postcard depicting Berlin's Brandenberg Gate, December 29, 1923. Letter to Nobel Prize–winning biochemist Hans von Euler-Chelpin and his wife Astrid thanking the couple for their friendly wishes. In fine condition. Pre-certified PSA/DNA.
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