Rudolf Gundlach (1892–1957) was a Polish military engineer, inventor and tank designer. He headed the design division of the Armored Weapons Technical Research Bureau (Biuro Badań Technicznych Broni Pancernych). He held the military rank of major in the Corps of Engineers of the Polish Army.
He was the chief designer of the Ursus wz. 29 armored car and supervised design work for the 7TP light tank and the 10TP fast tank prototype.
Henryk Zygalski (Polish pronunciation: [ˈxɛnrɨk zɨˈɡalski] ; 15 July 1908 – 30 August 1978) was a Polish mathematician and cryptologist who worked at breaking German Enigma-machine ciphers before and during World War II.
Jan Czochralski ( YAN chokh-RAHL-skee, Polish pronunciation: [ˈjan t͡ʂɔˈxralskʲi]; 23 October 1885 – 22 April 1953) was a Polish chemist who invented the Czochralski method, which is used for growing single crystals and in the production of semiconductor wafers. It is still used in over 90 percent of all electronics in the world that use semiconductors. He is the most cited Polish scholar.There is evidence that Czochralski sheltered two Jewish women in his home until the Warsaw Uprising to save them from the Germans and some evidence that he was instrumental in financially helping a previously owned Jewish business in the ghetto.