How many movies have Per Schwenzen and Rudolf Vogel collaborated on?

They have worked on 4 movies together! Their first movie together was Solang es hübsche Mädchen gibt (1955) while their highest rated movie together was I Often Think of Piroschka (1955). They have not worked together since Hula-Hoop, Conny (1959). They are most known for their comedy films together.