The schmaltrum turret could be found on what tanks other than the Panzerkampfwagen IV?
Schmalturm: The Schmalturm turret was a tank turret designed for use on the Panzer V Ausf. Schmalturm:  J medium tank and the VK 30.02 DB (a medium tank prototype). Panzer IV: The "Panzerkampfwagen" IV (PzKpfw IV), commonly known as the Panzer IV, was a German medium tank developed in the late 1930s and used extensively during the Second World War.
i don't know