How many movies have Fritz Muliar and Kurt Nachmann collaborated on?

They have worked on 13 movies together! Their first movie together was Symphonie in Gold (1956) while their highest rated movie together was I Learned It from Father (1964). They have not worked together since Die beiden Nachtwandler oder Das Notwendige und das Überflüssige (1973). They are most known for their comedy films together.