How many movies have Risto Salo and Tapio Hämäläinen collaborated on?

They have worked on 4 movies together! Their first movie together was Takiaispallo (1970) while their highest rated movie together was Lottovoittaja UKK Turhapuro (1976). They have not worked together since Rautakauppias Uuno Turhapuro, presidentin vävy (1978).