How many movies have Rudolf Nussgruber and Wolfram Schaerf collaborated on?

They have worked on 4 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 Ein Mann namens Parvus (1984). They are most known for their history films together.