Serbian-American physicist, physical chemist, inventor, and philanthropist (1858-1935) who was a founding member of the National Advisory Committee for Aeronautics (NACA) on March 3, 1915, which later became NASA. Color 3.5 x 5.5 postcard of the Serbian flag and coat of arms, boldly signed in ink, "Michael I. Pupin, Febr. 15, 1915." In fine condition. A desirable autograph from the period of NACA's founding.
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