Sturmgeschütz III was built on the chassis of a tank developed in Germany in what decade?
Sturmgeschütz III:  It was built on the chassis of the proven Panzer III tank, replacing the turret with an armored, fixed superstructure mounting a more powerful gun. Panzer III: The Panzerkampfwagen III, commonly known as the Panzer III, was a medium tank developed in the 1930s by Germany, and was used extensively in World War II.
i don't know