How many movies have Michel Deruelle and Monique Isnardon collaborated on?

They have worked on 4 movies together! Their first movie together was Murder at 45 R.P.M. (1960) while their highest rated movie together was Arsène Lupin vs. Arsène Lupin (1962). They have not worked together since From Hong Kong with Love (1975). They are most known for their comedy films together.