How many movies have Ralph Arthur Roberts and Trude Marlen acted in together?

They have worked on 3 movies together! Their first movie together was Spiel mit dem Feuer (1934) while their highest rated movie together was Meine Frau, die Perle (1937). They have not worked together since Meine Frau, die Perle (1937). They are most known for their comedy films together.