Karl-Gerät [SEP] designer
Karl-Gerät
""Karl-Gerät"" (040/041) (German literally "Karl-device"), also known as Mörser Karl, was a World War II German self-propelled siege mortar ("Mörser") designed and built by Rheinmetall. Its heaviest munition was a diameter, shell, and the range for its lightest shell of was just over . Each gun had to be accompanied by a crane, a two-piece heavy transport set of railcars, and several modified tanks to carry shells
first patented in 1903 by a German designer, Karl Puff. In the 1920s and 1930s, another German engineer, Gerlich, conducted experiments with coned-bore barrels that resulted in an experimental 7 mm anti-tank rifle with a muzzle velocity of 1,800 m/s.
Based on these works, Mauser-Werke AG developed a 28/20 mm anti-tank weapon initially designated "Gerät 231" or "MK.8202" in 1939–1940. In June–July 1940, an experimental batch of 94 (other sources