1929
Herman Potočnik, Croatian-Austrian engineer (born 1892)
Herman Potočnik, Croatian-Austrian engineer (born 1892)
Herman Potočnik, Croatian-Austrian engineer (born 1892)
Austrian military officer, electrical engineer and astronautics theorist (1892–1929)
Herman Potočnik, Croatian-Austrian engineer (born 1892)
Herman Potočnik, Croatian-Austrian engineer (born 1892)