How many movies have Heinz Weiss and Rudolf Nussgruber collaborated on?

They have worked on 3 movies together! Their first movie together was Friedrich III. '...gestorben als Kaiser' (1970) while their highest rated movie together was Claus Graf Stauffenberg (1970). They have not worked together since Max Hölz. Ein deutsches Lehrstück (1972). They are most known for their history films together.