in all US tanks (M3/M5 Stuart, M4 Sherman and others). After the Second World War the technology was adopted thorough the whole world. Even today, original Gundlach periscopes are used in some tanks and APCs. References Bibliography Grzegorz Łukomski and Rafał E. Stolarski, Nie tylko Enigma... Mjr Rudolf Gundlach (1892-1957) i jego wynalazek (Not Only Enigma... Major Rudolf Gundlach (1892-1957) and His Invention), Warsaw-London, 1999. See also Polish contribution to WWII List of Poles 1892 births 1957 deaths Polish military engineers 20th-century Polish engineers 20th-century Polish inventors People from Żyrardów County