How many movies have Frans Keulen and Richard Vroomen acted in together?

They have worked on 2 movies together! Their first movie together was George & Jimmy and the Sword of Krijn (1977) while their highest rated movie together was Billie Turf, het dikste studentje ter wereld (1978). They have not worked together since Billie Turf, het dikste studentje ter wereld (1978).