How many movies have Franz Rauch and Harry Liedtke collaborated on?

They have worked on 4 movies together! Their first movie together was Robert und Bertram (1928) while their highest rated movie together was Wenn am Sonntagabend die Dorfmusik spielt (1933). They have not worked together since Wenn am Sonntagabend die Dorfmusik spielt (1933). They are most known for their comedy films together.