How many movies have Hans Heinrich and Rudolf Schündler collaborated on?

They have worked on 3 movies together! Their first movie together was Der Stammbaum des Dr. Pistorius (1939) while their highest rated movie together was Heintje - Einmal wird die Sonne wieder scheinen (1970). They have not worked together since Heintje - Einmal wird die Sonne wieder scheinen (1970).